Hecho general: 84015 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 84015 is an unremarkable number.
Trivia: 84015 is an uninteresting number.
Fecha histórica: January 9th is the day in 1992 that the Assembly of the Serb People in Bosnia and Herzegovina proclaims the creation of Republika Srpska, a new state within Yugoslavia.