...isn't seven the most powerfully magical number, wouldn't seven-?" — Tom Riddle discusses the power of the number seven
is the most powerful
based on centuries of mythology, science, and mathematics.
Arithmancer Bridget Wenlock ( 1202– 1285) was the first witch to establish the magical properties of the number seven.
Seven is the age by which most experts believe that
magic will reveal itself in a wizard or witch.
Seven seen in the wizarding world
S.P.T to A.P.W.B.D: "The one with the power to vanquish the Dark Lord approaches ... born to those who have thrice defied him, born as the month dies ... and the Dark Lord will mark him as his equal..." seventh Molly and Arthur Weasley had seven children.
"Weasley" contains seven letters.
"Granger" contains seven letters.
The following people have seven syllables in their full names:
Ron Weasley (Ronald Bilius Weasley)
Hermione Granger (Hermione Jean Granger)
Ginny Weasley (Ginerva Molly Weasley)
Bill Weasley (William Arthur Weasley)
Percy Weasley (Percy Ignatius Weasley)
Albus Potter (Albus Severus Potter)
Regulus Black (Regulus Arcturus Black).
Minerva McGonagall (whose name has seven syllables) was said to be 70 years old in 1995.
The names Lily Evans and James Potter have seven syllables altogether.
Thaddeus Thurkell had seven children, all Squibs.
Walter Parkin has seven children.
Children go to school at Hogwarts for seven years.
There are seven floors at Hogwarts.
The Arithmancy professor, of Hogwarts, is named Septima Vector. Additionally, there was a Malfoy in the 18th century named Septimus; and Arthur Weasley's father, Septimus Weasley. In Latin, septimus means "seventh."
In the wizarding world, wizards and witches come of age at the age of seventeen, instead of eighteen.
Harry Potter paid seven Galleons for his wand.
There are seven hundred fouls in Quidditch.
There are seven players on a Quidditch team
The Wolfsbane Potion must be drunk every seven days before full moon.
Seven people come out of the Shrieking Shack in 1994 after Peter Pettigrew's crimes are uncovered:
Hagrid's pet, Fluffy
Sprout's Devil's Snare
Flitwick's flying keys
McGonagall's giant chess set
The Mirror of Erised
Break with a Banshee
Gadding with Ghouls
Holidays with Hags
Travels with Trolls
Voyages with Vampires
Wanderings with Werewolves
Year with the Yeti
Nicholas de Mimsy-Porpington
First year : Gryffindor vs. Slytherin
First year : Gryffindor vs. Hufflepuff
Second year : Gryffindor vs. Slytherin
Third year : Gryffindor vs. Ravenclaw
Third year : Gryffindor vs. Slytherin
Fifth year : Gryffindor vs. Slytherin
Sixth year : Gryffindor vs. Slytherin
(Note that Harry was in the hospital wing for the Gryffindor vs. Ravenclaw match in his first year. Quidditch was cancelled before Gryffindor could play Hufflepuff or Ravenclaw due to the basilisk attacks in Harry's second year. Harry fell off his broom due to because of dementors and Cedric Diggory got the Snitch in Harry's third year match of Gryffindor vs. Hufflepuff. There were no Hogwarts Quidditch matches in Harry's fourth year because Hogwarts was hosting the Triwizard Tournament. Harry earned a "lifelong" ban from Quidditch after beating up Draco Malfoy, and therefore, Ginny Weasley played Seeker in the Gryffindor matches against Hufflepuff and Ravenclaw. During Gryffindor's match against Hufflepuff in Harry's sixth year, the reserve Keeper, Cormac McLaggen, knocked Harry unconscious with a misaimed Bludger before Harry could get the Snitch, and Harry was put in detention by Professor Snape during the final match against Ravenclaw. Harry did not return to Hogwarts for his seventh year, and therefore could not play Seeker.)
Dumbledore shows Harry seven memories about Voldemort's past (including both the fake and real Horcrux memory).
Marvolo, Tom Riddle's middle name, has seven letters in it.
There are (possibly) seven Standard Book of Spells.
Voldemort made seven Horcruxes, even though he believed that six Horcruxes would create a seven-fragment soul (including the piece of soul in his body).
Tom Riddle's Diary
Marvolo Gaunt's Ring
Rowena Ravenclaw's Diadem
Salazar Slytherin's Locket
Helga Hufflepuff's Cup
Harry Potter (unintentionally and unknown to Voldemort)
The Battle of the Seven Potters
Infiltration of the Ministry of Magic
The Attack at Godric's Hollow (1997)
Ambush at the Lovegood House
The Battle of Malfoy Manor
1998 Break-in of Gringotts Wizarding Bank
The Battle of Hogwarts
In Godric's Hollow in 1981
Over the Philosopher's Stone while Voldemort was in control of Quirinus Quirrell
In the Chamber of Secrets in 1993
In Little Hangleton in 1995
During the Battle of the Department of Mysteries
During the Battle of the Seven Potters
During the Battle of Hogwarts
Hiding objects, as performed by Tom Riddle, Harry Potter, Draco Malfoy, and Sybill Trelawney
A restroom, as used unwittingly by Dumbledore
Recuperating from drunkenness, as used by Winky
Finding cleaning materials, as used by Filch
Hosting D.A. meetings
Hiding from Filch, as used by Fred and George
Hiding from the Carrows, as demonstrated first by Neville
Powdered Bicorn Horn
Shredded Boomslang Skin
A piece of the person you want to turn into.
There are seven known spell types:
Where was he when Voldemort fell.
Why did he never make any attempt to find Voldemort.
What has he been doing during the period between Voldemort's fall and rebirth.
Why did he stop Voldemort from procuring the Philosopher's Stone.
Why did he not return to Voldemort immediately when all Death Eaters were summoned.
Where was he during the Battle of the Department of Mysteries.
Why is Harry Potter still alive despite being under his mercy for five years.
Harry Potter's chocolate frog card stated that he was famous for seven reasons:
Being the first and only known wizard to have survived the killing curse.
Being the youngest seeker in a century, having gained a spot on the Gryffindor quiddich team at Hogwarts in 1991 at only eleven years old.
Finding and opening Salazar Slytherin's Chamber of Secrets in his second school year and defeating the monster within, which was a Basilisk.
Being the youngest competitor of the Triwizard Tournament and winner of said tournament in 1995.
Being the only known Gryffindor student that can speak Parseltongue.
Being the last master of death to have united the three Deathly Hallows
Defeating the most dangerous dark wizard of all time, Lord Voldemort, in 1998.
There are seven Core classes,which are taught at Hogwarts:
Defence Against the Dark Arts
History of Magic
Behind the scenes
There are seven books in the Harry Potter series, and eight movies.
The first book was released in 1997, and the final book was released in 2007.
There are seventeen chapters in the first book.
If you count the epilogue, there are thirty-seven chapters in the seventh book.
The epilogue itself is set in 2017.
The first years enter the castle in the seventh chapter of the first book.
Many fans expected (the seventh book) to be released on 07/07/2007, which also happened to be a Saturday, the day upon which Harry Potter books had previously been released. However, it was released on July 21 Harry Potter and the Deathly Hallows st of that year instead, two weeks later. It is thought that the more 'magical' date was rejected due to it also being the second anniversary of the 7/7 London Bombings in 2005. (21 is still a multiple of 7 though.)
The number on the back of Harry Potter's Quidditch robes in the films is seven (this could be a reference to the fact that usually the best player/captain in a football team, has the number 7 shirt).
Chapter four of is entitled "The Seven Potters".
Harry Potter and the Deathly Hallows In Deathly Hallows Part 1 Daniel Radcliffe played seven roles - Harry, Ron, Hermione, Fred, George, Mundungus, and Fleur during the Battle of the Seven Potters.
In the films, Voldemort is played by seven actors: Richard Bremmer, Ian Hart, Christian Coulson, Ralph Fiennes, Hero Fiennes-Tiffin, Frank Dillane and by Michael Berendt although the latter's scenes were cut and never seen.
 J. K. Rowling stated in interview that she chose to write seven books in total because she spent seven years in secondary school. Also, she wanted Harry to come of age at seventeen because it "just seems a good number for a wizard to come of age."
In the seventh Harry Potter book, J.K. split the dedication in seven parts.
J. K. Rowling stated in interview that the "big seven" in the Harry Potter series are: Harry Potter ( Daniel Radcliffe), Hermione Granger ( Emma Watson), Ron Weasley ( Rupert Grint), Ginny Weasley ( Bonnie Wright), Neville Longbottom ( Matt Lewis), Luna Lovegood ( Evanna Lynch), and Draco Malfoy ( Tom Felton).
 There were seven clues and seven opportunities to sign up and register for the Pottermore beta. The first clue was on 31 July 2011 (Harry's birthday) and the final was 6 August 2011. A clue was released each day and each clue was from a book in the series corresponding to the day. For example, day one's clue was from Philosopher's Stone and the final clue was from Deathly Hallows.
On 7 August, the Harry Potter series won seven awards at the 2011 Teen Choice Awards for Deathly Hallows: Part 1 and Part 2.
The Battle of Hogwarts in on 2 May, the 2nd day of the 5th month. 2+5=7
If the letters of the alphabet were turned into numbers (A=1, B=2, etc...), the letters in the name Harry would equal 70.
Nicolas Flamel is seven years older than his wife.
During Harry's hearing in the Ministry (in 1995), Dumbledore states that clause 7 of the Decree for Reasonable Restriction of Underage Sorcery allows the use of magic in life-threatening situations.
In Harry's copy of , he wrote in the Pixie section for the classification, "or Fantastic Beasts and Where to Find Them XXXXXXX if you're Lockhart." He actually mentions seven X's.
The first film in the Fantastic Beasts and Where to Find Them trilogy is set 70 years before the Harry Potter series.
Seven is also the highest single-digit prime number.
Seven on Wikipedia
Notes and references