Fait mathématique: 4340 is the number of 3×3 sliding puzzle positions that require exactly 27 moves to solve starting with the hole in the center.
Culture générale: 4340 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: November 18th is the day in 1865 that Mark Twain's short story The Celebrated Jumping Frog of Calaveras County is published in the New York Saturday Press.