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4,000,000
This number has only one significant digit: If a number does not contain an explicit decimal point, zeros to the immediate left of the implied decimal point at the end are not significant, because they are required to indicate the magnitude of the number. Therefore, the number 40000000 should preferably be written as 4 X 107.
4000000 pennies is exactly 4000000 pennies.
It is 4000000.
4000000 + 300000 + 90000 + 5000 + 50 + 5