Fatto generale: 1846 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1846 is an unremarkable number.
Trivia: 1846 is an uninteresting number.
Data storica: January 19th is the day in 1817 that an army of 5,423 soldiers, led by General José de San Martín, crosses the Andes from Argentina to liberate Chile and then Peru.