Fait général: 9858 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 9858 is a number whose sum of divisors is a 4^{th} power.
Culture générale: 9858 is an unremarkable number.
Date historique: December 27th is the day in 1997 that Protestant paramilitary leader Billy Wright is assassinated in Northern Ireland, United Kingdom.