4000 miles (1.609 kilometers/1 mile)
= 6436 kilometers
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4000 kilometers = 13,123,359.6 feet.
I'm thinking that's not what you wanted to ask but as written, the answer is 4000.
253440000 inches = 4000 miles
4000 feet = 1.22 km, approx.
4000 sq miles = 2560000 acres