Fait général: 4686 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 4686 is the denominator of the 70^{th} Bernoulli number.
Culture générale: 4686 is an unremarkable number.
Date historique: October 29th is the day in 312 that Constantine the Great enters Rome after his victory at the Milvian Bridge, stages a grand adventus in the city, and is met with popular jubilation.