Fatto generale: 19937 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 19937 is the largest known Mersenne prime exponent whose digits are all odd (also a circular prime).
Trivia: 19937 is an uninteresting number.
Data storica: August 1st is the day in 1980 that Vigdís Finnbogadóttir is elected President of Iceland and becomes the country's first democratically elected female head of state.