Fait général: 1842 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1842 is the number of rooted trees with 11 vertices.
Culture générale: 1842 is an uninteresting number.
Date historique: January 15th is the day in 1908 that the Alpha Kappa Alpha Sorority becomes the first Greek-letter organization founded and established by African American college women.