Fait mathématique: 87939 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 87939 is an unremarkable number.
Date historique: October 7th is the day in 1993 that the Great Flood of 1993 ends at St. Louis, Missouri, 103 days after it began, as the Mississippi River falls below flood stage.