Fatto generale: 40905 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 40905 is an unremarkable number.
Trivia: 40905 is a boring number.
Data storica: December 29th is the day in 1992 that Fernando Collor de Mello, president of Brazil, tries to resign amidst corruption charges, but is then impeached.