Fait général: 4399 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 4399 is a boring number.
Culture générale: 4399 is a boring number.
Date historique: January 16th is the day in 27 BC that Gaius Julius Caesar Octavianus is granted the title Augustus by the Roman Senate, marking the beginning of the Roman Empire.