Fatto generale: 43889 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 43889 is an uninteresting number.
Trivia: 43889 is an unremarkable number.
Data storica: February 29th is the day in 1972 that Hank Aaron becomes the first player in the history of Major League Baseball to sign a $200,000 contract.