General fact: 4037 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4037 is a member of the Fibonacci-type sequence starting with 1 and 6.
Trivia: 4037 is an unremarkable number.
Historical date: January 19th is the day in 1946 that General Douglas MacArthur establishes the International Military Tribunal for the Far East in Tokyo to try Japanese war criminals.