General fact: 80439 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 80439 is an uninteresting number.
Trivia: 80439 is an unremarkable number.
Historical date: March 26th is the day in 1999 that a jury in Michigan finds Dr. Jack Kevorkian guilty of second-degree murder for administering a lethal injection to a terminally ill man.