general_fact: 13739 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 13739 is an unremarkable number.
trivia: 13739 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: August 12th is the day in 2007 that the bulk carrier M/V New Flame collides with the oil tanker Torm Gertrud at the southernmost tip of Gibraltar, ending up partially submerged.