Fait général: 13992 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 13992 is an unremarkable number.
Culture générale: 13992 is a boring number.
Date historique: April 22nd is the day in 1915 that the use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres.