Fatto generale: 40523 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 40523 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 40523 is an uninteresting number.
Data storica: December 12th is the day in 1901 that Guglielmo Marconi receives the first transatlantic radio signal at Signal Hill in St John's, Newfoundland.