Mathematical fact: 1893 is the number of 3×3 sliding puzzle positions that require exactly 14 moves to solve starting with the hole in a corner.
Trivia: 1893 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: March 7th is the day in 2009 that the Kepler space observatory, designed to discover Earth-like planets orbiting other stars, is launched.