Fait mathématique: 25829 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 25829 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.