Fatto matematico: 17897 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 17897 is an uninteresting number.
Data storica: December 30th is the day in 1816 that the Treaty of St. Louis (1816) between the United States and the united Ottawa, Ojibwa, and Potawatomi Indian tribes is proclaimed.