Fait général: 2423 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2423 is a boring number.
Culture générale: 2423 is an uninteresting number.
Date historique: August 19th is the day in 2003 that a car-bomb attack on United Nations headquarters in Iraq kills the agency's top envoy Sergio Vieira de Mello and 21 other employees.