General fact: 4045 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4045 is an uninteresting number.
Trivia: 4045 is an unremarkable number.
Historical date: January 27th is the day in 1984 that Pop singer Michael Jackson suffers second degree burns to his scalp during the filming of a Pepsi commercial in the Shrine Auditorium.