Fatto generale: 23489 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 23489 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 23489 is an unremarkable number.
Data storica: April 22nd is the day in 1930 that the United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.