Fait général: 2405 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2405 is an uninteresting number.
Culture générale: 2405 is an uninteresting number.
Date historique: August 1st is the day in 1927 that the Nanchang Uprising marks the first significant battle in the Chinese Civil War between the Kuomintang and Communist Party of China.