Hecho general: 4230 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4230 is a boring number.
Trivia: 4230 is a boring number.
Fecha histórica: July 31st is the day in 1973 that a Delta Air Lines jetliner, flight DL 723 crashes while landing in fog at Logan Airport, Boston, Massachusetts killing 89.