Hecho matemático: 9538 is a value of n for which 4n and 5n together use each digit exactly once.
Trivia: 9538 is an unremarkable number.
Fecha histórica: February 10th is the day in 1798 that Louis Alexandre Berthier invades Rome, proclaims a Roman Republic on February 15 and then on February 20 takes Pope Pius VI prisoner.