Fatto generale: 1812 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1812 is the number of fullerenes with 60 carbon atoms.
Trivia: 1812 is an uninteresting number.
Data storica: December 16th is the day in 1947 that William Shockley, John Bardeen and Walter Brattain build the first practical point-contact transistor.