Fait général: 2309 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2309 is the largest prime factor of 2 × 3 × 5 × 7 × 11 - 1.
Culture générale: 2309 is an unremarkable number.
Date historique: April 27th is the day in 1992 that Russia and 12 other former Soviet republics become members of the International Monetary Fund and the World Bank.