Fait mathématique: 6396 is a divisor of the sum of the 4^{th} powers of its divisors.
Culture générale: 6396 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 5th is the day in 1803 that the Convention of Artlenburg leads to the French occupation of Hanover (which had been ruled by the British king).