General fact: 4249 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4249 is a value of n for which |cos(n)| is smaller than any previous integer.
Trivia: 4249 is a boring number.
Historical date: August 19th is the day in 2003 that a car-bomb attack on United Nations headquarters in Iraq kills the agency's top envoy Sergio Vieira de Mello and 21 other employees.