How do you write four million in Roman numeral?

Answer 1

To write four million in roman numeral, you would need 4,000 M's to equal 4,000,000 (one M = 1,000)

Improved Answer:-

It is: ((CD)) because it represents 10*1000*400 = 4,000,000

Answer 2

((CD)) = 400*10,000 = 4,000,000 = four million