3.97 million is 3,970,000.
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You write 8.8 million as 8,800,000
397 is a prime number, therefore prime factorization of 397 = 397.
To write 20.5 million numerically, you would write it as 20,500,000.
The number 397 is a prime number, so it only has two factors: 1 and 397.
The least common multiple of 397 and 1 is 397.