Q: How Many Digits in the Number 400,620,509?

 A: The number 400,620,509 has 9 digits.

How does 400,620,509 have 9 digits?

You simply count the number of digits from the first number to the last. Like this:


400620509
Digit # 123456789

What are the number of digits of the numbers near 400,620,509?

400,620,507400,620,508400,620,510400,620,511
9999

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