Fait mathématique: 23727 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 23727 is an uninteresting number.
Date historique: December 16th is the day in 755 that an Lushan revolts against Chancellor Yang Guozhong at Fanyang, initiating the An Shi Rebellion during the Tang Dynasty of China.