General fact: 8743 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 8743 is a number whose sum of divisors is a 4^{th} power.
Trivia: 8743 is a boring number.
Historical date: December 8th is the day in 2010 that the Japanese solar-sail spacecraft IKAROS passes the planet Venus at a distance of about 80,800 km.