math_fact: 398 is the number of integers with complexity 22.
trivia: 398 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 1st is the day in 1978 that Director Roman Polanski skips bail and flees the United States to France after pleading guilty to charges of engaging in sex with a 13-year-old girl.