Fait mathématique: 5279 is the number permutations of {1,2,3,...,20} where adjacent numbers differ by no more than 2.
Culture générale: 5279 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: June 14th is the day in 1941 that June deportation, the first major wave of Soviet mass deportations and murder of Estonians, Latvians and Lithuanians, begins.