Fait mathématique: 4743 is a value of n for which 2n and 5n together use the digits 1-9 exactly once.
Culture générale: 4743 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: December 25th is the day in 1261 that John IV Lascaris of the restored Eastern Roman Empire is deposed and blinded by orders of his co-ruler Michael VIII Palaeologus.