The digit in the ten-millions place in the number 123456789 is 1. In the place value system, each place value is 10 times greater than the one to its right. So, the ten-millions place is the fourth digit from the right in a 9-digit number.
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The hundredths digit is 7.
123456789 rounded to the nearest million is 123,000,000. When rounding to the nearest million, you look at the digit in the millions place (the digit to the left of the comma). Since the digit in the hundred millions place is 1 in this case, you keep the 1 and change all other digits to the right to zeros.
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A number divisible by 123456789 must be 0 or bigger than 123456789. It must, therefore have 1 digit or 9 digits (or more). A remainder of 1 makes no difference to the number of digits. In any case, there can be no number of 4 digits that is divisible by 123456789.