Fait général: 2457 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2457 is an uninteresting number.
Culture générale: 2457 is an unremarkable number.
Date historique: September 22nd is the day in 1792 that Primidi Vendémiaire of year 1 of the French Republican Calendar as the French First Republic comes into being.