When you write "1 Million", should it be "1 Million" or "1 million"?

I would assume capital based on the symbol for mega being 'M'.


You would write "1 million" or "1M". When abbreviated, capitalization is necessary, but by itself, "million" is lowercase.

capitalizemytitle.com explains this:

...million, billion, hundred, thousand are NOT capitalized, and neither are the words “billionaire” or “millionaire” as they are considered to be professions, and they follow the spelling rules of that class.

However, the first letter of million can be capitalized when abbreviated, as in “his net worth is well over $1,000,000MM” or “The stock market received an injection of $3,697,834Mil to keep it from collapsing”.

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