Fatto generale: 18688 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 18688 is a boring number.
Trivia: 18688 is a boring number.
Data storica: March 1st is the day in 1642 that Georgeana, Massachusetts (now known as York, Maine), becomes the first incorporated city in the United States.