Fatto generale: 7389 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 7389 is an unremarkable number.
Trivia: 7389 is an uninteresting number.
Data storica: March 24th is the day in 1882 that Robert Koch announces the discovery of mycobacterium tuberculosis, the bacterium responsible for tuberculosis.