Mathematical fact: 1390 is the smallest number in base 6 to have 5 different digits.
Trivia: 1390 is an unremarkable number.
Historical date: October 21st is the day in 1520 that João Álvares Fagundes discovers the islands of Saint-Pierre and Miquelon, bestowing them their original name of "Islands of the 11,000 Virgins".