general_fact: 18477 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 18477 is a boring number.
trivia: 18477 is an uninteresting number.
historical_date: August 2nd is the day in 1610 that Henry Hudson sails into what is now known as Hudson Bay thinking he had made it through the Northwest Passage and reached the Pacific Ocean.