1,000,000,000
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As a number 1/4 of a billion is 250,000,000
0.4 billion is four tenths of one billion. One tenth of a billion is 100 million. (A billion is one thousand millions.) So four tenths of a billion is 400 million, or 400,000,000.
One billion five hundred million.
One billion dollars is 1000 times one million dollars, or $1x109, or $1,000,000,000.
One Billion Five Hundred and Seventeen Million = 1,517,000,000