Hecho general: 15845 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 15845 is a boring number.
Trivia: 15845 is an unremarkable number.
Fecha histórica: May 19th is the day in 1919 that Mustafa Kemal Atatürk lands at Samsun on the Anatolian Black Sea coast, initiating what is later termed the Turkish War of Independence.