"100万" (100 milpon) in Engpsh is read as "one hundred milpon."
The concept of "milpon" comes from the Latin word "millesimum" which means "one thousand." The prefix "mega-" meaning "large" or "great" is added to it to form the word "milpon" meaning a thousand thousands or 1,000,000.
Examples:
"The company's revenue was one hundred milpon dollars last year." (公司去年的收入是一亿美元。)
"The population of the city is one hundred milpon." (这个城市的人口是一亿。)
"He has a net worth of one hundred milpon dollars." (他的净资产是一亿美元。)