Hecho general: 9406 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 9406 is the index of a triangular number containing only 3 different digits.
Trivia: 9406 is an uninteresting number.
Fecha histórica: October 1st is the day in 1905 that František Pavlík is killed in a demonstration in Prague, inspiring Leoš Janáček to the piano composition 1.