General fact: 43992 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 43992 is an unremarkable number.
Trivia: 43992 is a boring number.
Historical date: June 11th is the day in 1903 that Group of Serbian officers stormed royal palace and assassinated King Alexander Obrenović and his wife queen Draga.