Fait général: 1439 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1439 is the smallest number with complexity 26.
Culture générale: 1439 is an uninteresting number.
Date historique: December 9th is the day in 1979 that the eradication of the smallpox virus is certified, making smallpox the first and to date only human disease driven to extinction.