Fatto generale: 4139 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4139 is an unremarkable number.
Trivia: 4139 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: May 1st is the day in 1915 that the RMS Lusitania departs from New York City on her two hundred and second, and final, crossing of the North Atlantic.