Mathematical fact: 989 is the smallest number so that it and its reverse are divisible by 43.
Trivia: 989 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: September 15th is the day in 1968 that the Soviet Zond 5 spaceship is launched, becoming the first spacecraft to fly around the Moon and re-enter the Earth's atmosphere.