do something like set text to variable &" Million "
What this is that the variable is the number of that million and the "&" is just a placement to tell the code to add something the (" Million ") is telling what non variable text to put here.
So it should turn out like 1 Million on your textbox.
If i am guessing right you are making something like a farming type game or idle so add this condition if Million is not equal to zero set text to variable&" Million " So in other word If million is at zero it will not run but if it more then zero then it will set the text. This is the easy version There are other more complex version.
But id suggest to try to label each text box according to the value it represent. so one for million , hundred thousand, ten thousand and so on. This would make it really easy to keep track of where you are with the currency. rather then having a total number divided by the next current number.