General fact: 4252 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4252 is the smallest number in base 8 to have 5 different digits.
Trivia: 4252 is a boring number.
Historical date: August 22nd is the day in 1985 that Manchester Air Disaster sees 55 people killed when a fire breaks out on a commercial aircraft at Manchester Airport.