Fait général: 1723 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1723 is a boring number.
Culture générale: 1723 is an uninteresting number.
Date historique: September 18th is the day in 1837 that Tiffany and Co. (first named Tiffany & Young) is founded by Charles Lewis Tiffany and Teddy Young in New York City.