Fait mathématique: 8484 is the reciprocal of the sum of the reciprocals of 13332 and its reverse.
Culture générale: 8484 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: March 24th is the day in 1603 that Tokugawa Ieyasu is granted the title of shogun from Emperor Go-Yozei, and establishes the Tokugawa Shogunate in Edo, Japan.