Mathematical fact: 1383 is the number of anisohedral 13-hexes.
Trivia: 1383 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: October 14th is the day in 1956 that Dr. B. R. Ambedkar, the Indian Untouchable caste leader, converts to Buddhism along with 385,000 of his followers (see Neo-Buddhism).