Fatto generale: 84365 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 84365 is an uninteresting number.
Trivia: 84365 is an uninteresting number.
Data storica: December 25th is the day in 1261 that John IV Lascaris of the restored Eastern Roman Empire is deposed and blinded by orders of his co-ruler Michael VIII Palaeologus.