Hecho matemático: 97423 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 97423 is a boring number.
Fecha histórica: September 25th is the day in 1804 that the Teton Sioux (a subdivision of the Lakota) demand one of the boats from the Lewis and Clark Expedition as a toll for moving further upriver.