2: The number of famous names who were at Eton at the same time as Harry. Eddie Redmayne was three years above him in the same year as Prince William, and Tom Hiddleston was four years above him.
4: The number of music festivals he's a regular at — Womad, Glastonbury, Wireless, and The Valley.
7: The number of names he's had (that we know of . . .). Following his marriage to Meghan Markle, Harry became His Royal Highness The Duke of Sussex; Prince Harry is used as a shorter version. He was previously, His Royal Highness Prince Henry Charles Albert David of Wales, and was Harry Mountbatten-Windsor at school, Captain Wales in the army, Spike Wells on Facebook, and nicknamed "Haz" by Chelsy Davy.
1: The number of years he was held back at school after the death of his mother.