Fait général: 13508 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 13508 is a boring number.
Culture générale: 13508 is an unremarkable number.
Date historique: December 24th is the day in 1966 that a Canadair CL-44 chartered by the United States military crashes into a small village in South Vietnam, killing 129.