Math Trivia. ;|

• 40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in reverse order. 

• From 0 to 1,000, the letter "A" only appears in 1,000 "one thousand"

• 1089 multiplied by 9 gives an exact reverse: 9801.
  
  
  Source: http://www.sciensational.com/maths.html