Fatto generale: 16863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 16863 is an unremarkable number.
Trivia: 16863 is a boring number.
Data storica: March 2nd is the day in 1992 that Armenia, Azerbaijan, Kazakhstan, Kyrgyzstan, Moldova, San Marino, Tajikistan, Turkmenistan and Uzbekistan join the United Nations.