Fatto matematico: 9427 is the smallest number that can not be formed using the digit 1 at most 29 times, together with the symbols +, –, × and ÷.
Trivia: 9427 is an unremarkable number.
Data storica: October 22nd is the day in 1866 that a plebiscite ratifies the annexion of Veneto and Mantua to Italy, occurred three days before, on October 19.