400,000,000 = four hundred million.
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400 million equates to 0.4 billion.
To write out 400,000,000 in words, you would say "four hundred million." This number is composed of four hundred (400) followed by the word "million," which represents the seven zeros in the numerical form. This is the standard way to express this number in words according to the rules of the English language.
939,436,615,378
You can write one hundred twelve thousand.
Eighth.