General fact: 1390 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 1390 is the smallest number in base 6 to have 5 different digits.
Trivia: 1390 is an uninteresting number.
Historical date: October 21st is the day in 1959 that President Dwight D. Eisenhower signs an executive order transferring Wernher von Braun and other German scientists from the United States Army to NASA.