Fatto generale: 7915 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 7915 is an unremarkable number.
Trivia: 7915 is an uninteresting number.
Data storica: September 1st is the day in 1873 that Cetshwayo ascends to the throne as king of the Zulu nation following the death of his father Mpande.