Fait mathématique: 4140 is the 8^{th} Bell number.
Culture générale: 4140 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: May 2nd is the day in 1536 that Anne Boleyn, Queen of England, is arrested and imprisoned on charges of adultery, incest, treason and witchcraft.