What is a Spy Number?

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Do you know What is a Spy Number? If you are in an opinion that it must be a number which secretly conveys information about other numbers like a spy, then you are absolutely wrong.

What is a Spy Number?

 
Definition of a Spy number: A spy number is that positive integer, whose sum of the digits is equal to the product of its digits. That is, 
Sum of its digits = Product of its digits
 
Example:  
1421 is a Spy number.
 
Sum = 1 + 4 + 2 + 1 = 8 and
 
Product = 1 × 4 × 2 × 1 = 8
 
We observe that sum of the digits of 1421 is equal to the product of the digits of 1421. Therefore, 1421 is called a Spy number.
 
This is how you can check whether a given number is a spy number or not.
 
Some other examples of Spy Number: 22, 123, 321, 1241, 1124, 1142 etc.
 
You can watch the video here:

 

 

Spy numbers List

 
Below is the list of Spy numbers between 1 and 10000.
 
spy-numbers-between-1-10000
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