How many millions are in one billion?

There is 1,000 million in a billion.

1,000,000,000 (billion) / 1,000,000 (million) = 1,000
There are two answers to this.

English billion = 1, 000, 000, 000, 000 (million million)

American billion = 1, 000, 000, 000 (thousand million)
Try a thousand?