math_fact: 9424 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 9424 is an uninteresting number.
historical_date: October 19th is the day in 1866 that Venice - Annexion of Veneto and Mantua to Italy - At Hotel Europa, Austria hands over Veneto to France, which hands it immediately over to Italy.