Fait général: 4023 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 4023 is the number of ways to tile a 3×23 rectangle with 3×1 rectangles.
Culture générale: 4023 is an unremarkable number.
Date historique: January 5th is the day in 1971 that the first One Day International cricket match is held between Australia and England at the Melbourne Cricket Ground.