Fait général: 1605 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1605 is the number of 7-octs.
Culture générale: 1605 is an unremarkable number.
Date historique: May 23rd is the day in 1934 that the Auto-Lite Strike culminates in the "Battle of Toledo", a five-day melée between 1,300 troops of the Ohio National Guard and 6,000 picketers.