Fatto generale: 7926 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 7926 is the diameter of the earth in miles.
Trivia: 7926 is an unremarkable number.
Data storica: September 12th is the day in 1940 that an explosion at the Hercules Powder Company plant in Kenvil, New Jersey kills 51 people and injures over 200.