Fait mathématique: 1475 is the maximum value of n so that there exist 5 denominations of stamps so that every postage from 1 to n can be paid for with at most 11 stamps.
Culture générale: 1475 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: January 14th is the day in 1301 that Andrew III of Hungary dies, ending the Árpád dynasty in Hungary.