Fait mathématique: 9858 is a number whose sum of divisors is a 4^{th} power.
Culture générale: 9858 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: December 27th is the day in 1845 that Ether anesthetic is used for childbirth for the first time by Dr. Crawford Williamson Long in Jefferson, Georgia.