Hecho matemático: 9378 is a value of n for which 4n and 5n together use each digit exactly once.
Trivia: 9378 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: September 3rd is the day in 1914 that William, Prince of Albania leaves the country after just six months due to opposition to his rule.