1000
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That would be the same as the smallest four-digit even number: 1,000, which also happens to be the smallest four-digit whole number.
The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.
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.
The smallest four-digit number not using zero is 1000. In a four-digit number, the first digit cannot be zero, so the smallest possible value for the first digit is 1. The remaining three digits can be any number from 0-9, so the smallest possible four-digit number is 1000.
10000This is an even number, and the number immediately preceding it is 9999, which has only four digits.Hence it is the smallest 5-digit even number.Note that here we're not considering negative numbers. If we consider negative numbers, then the smallest 5-digit even number would be -99998.The number immediately preceding it is -99999, which is not even, and the number immediately preceding that is -100000, which has six digits.