Fatto matematico: 7956 is a value of n for which n and 4n together use each digit 1-9 exactly once.
Trivia: 7956 is an uninteresting number.
Data storica: October 12th is the day in 1983 that Japan's former Prime Minister Tanaka Kakuei is found guilty of taking a $2 million bribe from Lockheed and is sentenced to 4 years in jail.