Fatto generale: 7936 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 7936 is the 5^{th} tangent number.
Trivia: 7936 is a boring number.
Data storica: September 22nd is the day in 1857 that the Russian warship Lefort capsizes and sinks during a storm in the Gulf of Finland, killing all 826 aboard.