General fact: 15832 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 15832 is a boring number.
Trivia: 15832 is an uninteresting number.
Historical date: May 6th is the day in 1536 that the Siege of Cuzco commences, in which Incan forces attempt to retake the city from Cuzco from the Spanish.