General fact: 19853 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 19853 is an uninteresting number.
Trivia: 19853 is a boring number.
Historical date: May 9th is the day in 1969 that Carlos Lamarca leads the first urban guerrilla action against the military dictatorship of Brazil in São Paulo, by robbing two banks.