Mathematically 40

Forty (40)
1. It is the only number whose letters are in the alphabetical order.
FORTY

2. It can be partitioned into 31185 ways.

3. It is a pentagonal pyramid number being the sum of first four pentagonal numbers. The first few pentagonal pyramid numbers are – 1, 6, 18, 40, and 75. The formula for the nth pentagonal pyramid number is given by--

4. It is the 7th abundant number.

5. The Celsius and Fahrenheit temperature come together at minus 40.
- 40degree C = - 40degreeF

6. One Furlong is equal to 40 rods.

7. It is an octagonal number. An octagonal number is a number that creates a octagon. The first few octagonal numbers are 1, 8, 21 and 40.

8. It is the fourth star number. This pattern is made up of a square and four equilateral triangles.

Dr Rajesh Kr Thakur
rkthakur1974@gmail.com