general_fact: 47438 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47438 is a boring number.
trivia: 47438 is an unremarkable number.
historical_date: November 17th is the day in 1990 that Fugendake, part of the Mount Unzen volcanic complex, Nagasaki prefecture, Japan becomes active again and erupts.