Setting up a Segmentation with Smart List Filters - Annual Revenue Variable

Hello All,

I am creating a Segmentation using the smart list filter "Annual Revenue", is there a best practice for entering in the revenue breakdown segments?

For instance, I want a segmentation of companies with an annual revenue "Less than $1 mil" so in the Smart List I used the Annual revenue filter as below:

Annual Revenue: "Less Than" "1000000"

For the revenue variable which format should be used for optimal segmentation:

1000000
1,000,000
$1000000
$1,000,000

Thanks for any help on this as I want to make this segmentation as accurate as possible.