Fatto matematico: 5853 is the index of a triangular number containing only 3 different digits.
Trivia: 5853 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: 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.