80
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One above 39. One below 41. Thirty-Nine above 1.
40 is an even number, the product of the primes 2 (cubed) and 5,
i.e. has the factorization 2 x 2 x 2 x 5
40 in Roman Numerals is XL -- the lowest number using L (50) and X used as a pre-subtractor.
The number 40 is the birthday most people dread. 40 is when you realize you're looking more and more like your dad if you're male, or your mother if you're female. 40 is when you realize...you've already lived half your life IF you live to age 80. Age 40 is when you wonder just HOW you ever survived all the crazy things you did in your teens, 20s, and 30s--- and when you hope you'll make it to 50 with continued good health. Age 40 is when you realize you better start living the life you want to live, before you run out of years to do it. Age 40 is when you realize that although you LOOK your age, your mind thinks you are still 18-20 years old! And THAT is 40!