Fatto generale: 2409 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2409 is a boring number.
Trivia: 2409 is an unremarkable number.
Data storica: August 5th is the day in 1858 that Cyrus West Field and others complete the first transatlantic telegraph cable after several unsuccessful attempts.