Fatto generale: 11904 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 11904 is an unremarkable number.
Trivia: 11904 is an unremarkable number.
Data storica: August 3rd is the day in 1936 that a fire wipes out Kursha-2 in the Meshchera Lowlands, Ryazan Oblast, Russia, killing 1,200 and leaving only 20 survivors.