Fait mathématique: 4443 is a number n for which n^{2}+1 is 10 times another square.
Culture générale: 4443 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: February 29th is the day in 1936 that Baby Snooks, played by Fanny Brice, debuts on the radio program The Ziegfeld Follies of the Air.