General fact: 14507 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 14507 is an unremarkable number.
Trivia: 14507 is a boring number.
Historical date: September 19th is the day in 1940 that Witold Pilecki is voluntarily captured and sent to Auschwitz in order to smuggle out information and start a resistance.