Mathematical fact: 2074 is the smallest number that can not be formed using the digit 1 at most 24 times, together with the symbols +, –, × and ÷.
Trivia: 2074 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: September 4th is the day in 626 that Li Shimin, posthumously known as Emperor Taizong of Tang, assumes the throne over the Tang Dynasty of China.