Four hundred thousand in numbers is 400,000. It's not rocket science, honey. Just add some commas and you're good to go.
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The answer is for sure 2,309.405
Four thousand of them.
4,200,000 or 4.2 million
Rule of thumb when listing, writing numbers... Only use "and" when using cents. ie. Two hundred thousand "and" forty four cents. Also, $200,000.44
To write four hundred thousand five hundred ten in numeric form is 400,510.