General fact: 5834 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 5834 is the number of digits of the 21^{st} perfect number.
Trivia: 5834 is an unremarkable number.
Historical date: December 21st is the day in 1967 that Louis Washkansky, the first man to undergo a heart transplant, dies in Cape Town, South Africa, after living for 18 days after the transplant.