Fait mathématique: 9643 is the smallest number that can not be formed using the numbers 2^{0}, 2^{1}, ... , 2^{7}, together with the symbols +, –, × and ÷.
Culture générale: 9643 is an uninteresting number.
Date historique: May 26th is the day in 1972 that the United States and the Soviet Union sign the Anti-Ballistic Missile Treaty.