math_fact: 5383 is the number of triangles of any size contained in the triangle of side 27 on a triangular grid.
trivia: 5383 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 26th is the day in 2009 that Typhoon Ketsana (2009) hit the Philippines, China, Vietnam, Cambodia, Laos and Thailand, causing 700 fatalities.