General fact: 23742 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 23742 is a boring number.
Trivia: 23742 is a boring number.
Historical date: December 31st is the day in 1999 that Boris Yeltsin, the first president of Russia, resigns as President of Russia, leaving Prime Minister Vladimir Putin as the acting President.