Fatto generale: 2357 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2357 is a SmarandacheÐWellin prime.
Trivia: 2357 is a boring number.
Data storica: June 14th is the day in 1287 that Kublai Khan defeated the force of Nayan and other traditionalist Borjigin princes in East Mongolia and Manchuria.