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It is 399.

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Q: What is the smallest whole number where the sum of the digits is 21?
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What is the smallest whole number that is equal to seven times the sum of its digits?

21


A whole number is greater than 20 and less than 2000 what is the smallest possible value of the sum of all its digits?

The answer to the smallest possible value of the sum of all the digits is 1. the number can either be 100 or 1000 - either way the sum is still one.


How many 3 digits whole numbers whose sum is 3?

There are no 3-digit whole numbers whose digits sum to 3. The smallest 3-digit number is 100, and the largest is 999, but in neither case is the sum of the digits equal to 3.


What is the smallest whole number that is equal to twice the sum of its digits?

18 1 + 8 = 9 and 9 x 2 = 18


What is the smallest prime number whose sum of its digits forms a number that is a perfect cube?

I think it will be 17. The sum of digits is 8, which is the cube of 2.


What whole number increased by the sum of its digits equals?

It is another whole number.


What is the smallest sum of nine nonzero digits prime number?

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What is the smallest two digit number that can be divided by its own digits?

By the sum of its digits: 10. By each of its individual digits: 11.


The smallest two digits number plus the biggest two digits number is?

The smallest two digit number is 00 (a number used as a wire gauge) and the biggest is 99, so the sum of the biggest and smallest 2-digits numbers is 99 (99 + 00).


What is the smallest whole number you can make using the digits 3 4 9 1?

If you have to use all four digits - 1349. If you can use them in a sum 9-4-3-1 = 1


What number has four digits and the sum of the digits equals thireteen?

There are several hundred of them. One example, the smallest, is 1039


A 2 digit number with 2 different digits has a special property When the sum of the digits added to the product of it's digits the result is the number itself What is the smallest number with?

19