Fatto generale: 1392 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1392 is the number of ternary square-free words of length 18.
Trivia: 1392 is an uninteresting number.
Data storica: October 23rd is the day in 1295 that the first treaty forming the Auld Alliance between Scotland and France against England is signed in Paris.