Fait général: 7939 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 7939 is a boring number.
Culture générale: 7939 is a boring number.
Date historique: September 25th is the day in 1868 that the Imperial Russian steam frigate Alexander Neuski is shipwrecked off Jutland while carrying Grand Duke Alexei of Russia.