Fait mathématique: 13787 is an uninteresting number.
Culture générale: 13787 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: September 29th is the day in 2004 that the Burt Rutan Ansari X Prize entry SpaceShipOne performs a successful spaceflight, the first of two required to win the prize.