General fact: 2743 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 2743 is a centered dodecahedral number.
Trivia: 2743 is an uninteresting number.
Historical date: July 5th is the day in 2009 that a series of violent riots break out in Ürümqi, the capital city of the Xinjiang Uyghur Autonomous Region in China.