math_fact: 9629 is a value of n for which 2n and 7n together use each digit exactly once.
trivia: 9629 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: May 12th is the day in 1743 that Maria Theresa of Austria is crowned Queen of Bohemia after defeating her rival, Charles VII, Holy Roman Emperor.