11112
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123478
It is 200000.
it would be 0000.01
100122 or, if negative numbers are permitted, -998877
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.