General fact: 45947 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 45947 is an unremarkable number.
Trivia: 45947 is an uninteresting number.
Historical date: October 18th is the day in 1860 that the Second Opium War finally ends at the Convention of Peking with the ratification of the Treaty of Tientsin, an unequal treaty.