If you are speaking of just the number 1947, it would be one thousand nine hundred forty-seven. If you are referring to the year 1947, it is spoken and written as nineteen forty-seven. Normally, however, you would not write a number this large in words. You would simply write it as 1947, whether it refers to the year or not.
1947
1947 World Series - 1947 was released on: USA: 30 September 1947
1947 Army-Navy Game - 1947 TV was released on: USA: 29 November 1947
Memory Lane - 1947 1947-07-01 was released on: USA: 1 July 1947
Memory Lane - 1947 1947-07-02 was released on: USA: 2 July 1947
Memory Lane - 1947 1947-07-03 was released on: USA: 3 July 1947
Memory Lane - 1947 1947-07-04 was released on: USA: 4 July 1947
Memory Lane - 1947 1947-07-06 was released on: USA: 6 July 1947
Memory Lane - 1947 1947-07-08 was released on: USA: 8 July 1947
Memory Lane - 1947 1947-07-10 was released on: USA: 10 July 1947
Memory Lane - 1947 1947-07-09 was released on: USA: 9 July 1947
Memory Lane - 1947 1947-07-11 was released on: USA: 11 July 1947