general_fact: 52307 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 52307 is an unremarkable number.
trivia: 52307 is an unremarkable number.
historical_date: March 18th is the day in 235 that Emperor Alexander Severus and his mother Julia Mamaea are murdered by legionaries near Moguntiacum (modern Mainz).