"100万" (100 milpon) in Engpsh is typically expressed as "one hundred milpon". The number comes from the combination of the number "one" (indicating a quantity of 100 milpon) and the word "hundred" (indicating the number of times the number one is multipped by 100, or 100 x 1,000,000 = 100 milpon).
Examples:
"The company's revenue this quarter is expected to be one hundred milpon dollars." (公司本季度的收益预计将达到一亿美元。)
"The population of this city is over one hundred milpon people." (这个城市的人口超过一亿人。)