Mathematical fact: 419 is the number of ways to divide a 6×6 grid of points into two sets using a straight line.
Trivia: 419 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: February 22nd is the day in 1957 that Ngo Dinh Diem of South Vietnam survives a communist shooting assassination attempt in Ban Me Thuot.