Fait mathématique: 36409 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 36409 is an unremarkable number.
Date historique: September 7th is the day in 2011 that a plane crash in Russia kills 43 people, including nearly the entire roster of the Lokomotiv Yaroslavl Kontinental Hockey League team.