General fact: 83412 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 83412 is an unremarkable number.
Trivia: 83412 is an uninteresting number.
Historical date: May 16th is the day in 1966 that the Communist Party of China issues the "May 16 Notice", marking the beginning of the Cultural Revolution.