It depends on the degree of rounding.
To the nearest integer, there is none.
Otherwise 999.
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Rounding up implies the number is smaller than 1000. However, a number smaller than 1000 cannot be a 4-digit number. So there cannot be such a number. What was said is wrong. The greatest 4 digit number that rounds up is 999.9
949, which rounds down to 900.
1000
1000
Any number 499 or less rounds to zero. Any number 500 or greater rounds to 1000.