Mathematical fact: 2407 is a value of n for which s(f(n)) = 2s(n).
Trivia: 2407 is an unremarkable number.
Historical date: 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.