Q: What is the digital root of 135,786,721

 A: 4

Why is 4 the digital root of the number 135,786,721?

The digital root of a number is calculated by splitting the digits of a number and then adding them together. You keep splitting and adding the digits until you reach a single positive number.

How do you calculate the digital root of 135,786,721?


Split the number up and add each digit together:


1 + 3 + 5 + 7 + 8 + 6 + 7 + 2 + 1 = 40

If the answer is more than one digit, you would add each digit of the answer together again:

4 + 0 = 4

What is the digital root of number 135,786,721?

Answer: 4


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Digital Root 2356

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