To write 400 billion in numbers, you would write it as 400,000,000,000. This is because each comma represents a grouping of three digits in the numerical system. So, 400 billion is written as 400 followed by nine zeros.
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1.52 billion written in numbers is 1,520,000,000
15.8 billion = 15,800,000,000
Six billion = 6,000,000,000
3,900,000,000 is 3.9 billion.
1,270,000,000