Mathematical fact: 9182 is a value of n for which 4n and 5n together use each digit exactly once.
Trivia: 9182 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: February 19th is the day in 1600 that the Peruvian stratovolcano Huaynaputina explodes in the most violent eruption in the recorded history of South America.