Fait mathématique: 1784 is a number n for which f(n) is a repdigit.
Culture générale: 1784 is an uninteresting number.
Date historique: November 18th is the day in 1930 that Soka Kyoiku Gakkai, a Buddhist association later renamed Soka Gakkai, is founded by Japanese educators Tsunesaburo Makiguchi and Josei Toda.