Fait mathématique: 53723 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 53723 is an uninteresting number.
Date historique: February 1st is the day in 1713 that the Kalabalik or Tumult in Bendery results from the Ottoman sultan's order that his unwelcome guest, King Charles XII of Sweden, be seized.