Hecho general: 5207 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5207 is an unremarkable number.
Trivia: 5207 is a boring number.
Fecha histórica: April 3rd is the day in 1955 that the American Civil Liberties Union announces it will defend Allen Ginsberg's book Howl against obscenity charges.