Hecho matemático: 406 is the number of ways to tile a 3×17 rectangle with 3×1 rectangles.
Trivia: 406 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: February 9th is the day in 1964 that the Beatles make their first appearance on The Ed Sullivan Show, performing before a "record-busting" audience of 73 million viewers.