Importance of 18

Eighteen (18)

1.      It is a Lucas number. Like Fibonacci number, in Lucas number the next number of this series is obtained by summing up the previous two numbers. The series goes like- 1, 3, 4, 7, 11, 18…

2.It is the sum of four consecutive numbers.        

                                                                                 18 = 3 + 4 + 5 + 6

3.      The number 18 is considered a number of the devil due to the fact that 6 + 6 + 6 = 18 and 666 is the number of beast.

4.      It is the only number which is twice the sum of its digits.                                                           

      18 = 2 x ( 1 + 8 )

5.      It is a Pentagonal Pyramid number because it is the sum of three Pentagonal numbers.

6.      It is the second abundant number. A number is called Abundant if the sum of its divisor excluding itself is more than itself. The divisors of 18 are 1, 2, 3, 6, and 9.                                     1 + 2 + 3 + 6 + 9 > 18

7.      It can be portioned in 385 ways.

8.      The cube and fourth powers of 18 use all the digits from 0 to 9.                                                18³ = 5832                                  18⁴ = 104976

9.      It is equal to sum of the digits of its cube, its 6^th power and 7^th power.                   

 18³ = 5832 and 5 + 8 + 3 + 2 = 18                                                                                     

18⁶ = 34012224 and 3 + 4 + 0 + 1 + 2 + 2 + 2 + 4 = 18                          

                                 

18⁷ = 612220032 and 6 + 1 + 2 + 2 + 2+ 0 + 0 + 3 + 2 = 18

10.  It is the amount of time taken by Moon to tilt its orbit in order to rotate a full circle.

Send your comment to 

Rajesh Kumar Thakur

rkthakur1974@gmail.com