Fait mathématique: 16923 is an unremarkable number.
Culture générale: 16923 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: May 1st is the day in 1576 that Stefan Batory, the reigning Prince of Transylvania, marries Anna Jagiellon and they become the co-rulers of the Polish-Lithuanian Commonwealth.