general_fact: 47174 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47174 is an uninteresting number.
trivia: 47174 is an unremarkable number.
historical_date: February 26th is the day in 1935 that Robert Watson-Watt carries out a demonstration near Daventry which leads directly to the development of RADAR in the United Kingdom.