That depends how you want to round it, for example, to the closest multiple of 1, of 10, of 100, etc. But if you allow real numbers, then no matter how you round, there is no least number that you can round to a certain number!
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This statement is not true, since 1,000,000 has 7 digits, a value rounded up produces 6 digits. However, the smallest number to round up to 1,000,000 is 500,000, which has 6 digits.
The least number that can be rounded to 400 (to the nearest 400) is 200.
500,000 is the least whole number that can be rounded to the nearest millions.
The least possible number that can be rounded off to 25000 is 24995.
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