To the nearest thousand: 1499
To the nearest hundred: 1049
To the nearest ten: 1005
With regards to rounding numbers ending in 5, I advocate rounding so that the previous digit becomes an even digit. If 5s are always rounded up [or down] you introduce an upward [downward] rounding bias. The suggested method avoids introducing a rounding bias and is reproducible by others.
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The greatest or largest 3 digit number is 999 because the next digit on the number line is 1000 a 4 digit number.
99999 - 1000 = 98999
997
999 - 1000
If you allow non integers, then your smallest four-digit number would be .0001. If you only allow integers, then your smallest four-digit number would be 1000. Your largest four-digit number would be 9999.