Fatto generale: 5939 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5939 is the smallest prime so that it and the next 2 primes are all equal to 3 (mod 7).
Trivia: 5939 is an unremarkable number.
Data storica: April 4th is the day in 1818 that the United States Congress adopts the flag of the United States with 13 red and white stripes and one star for each state (then 20).