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 an uninteresting number.
Date historique: November 18th is the day in 1421 that a seawall at the Zuiderzee dike in the Netherlands breaks, flooding 72 villages and killing about 10,000 people.