general_fact: 83939 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 83939 is an unremarkable number.
trivia: 83939 is an uninteresting number.
historical_date: October 25th is the day in 1944 that the USS Tang under Richard O'Kane (the top American submarine captain of World War II) is sunk by the ship's own malfunctioning torpedo.