11111 or even smaller (if accepted) 00000
How about 10000
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The smallest four digit number is 1000. It is even so 1001 is the smallest four digit number that is odd.
12346
The smallest even 4-digit number using the digits 5, 7, 4, and 9 is 4579. To create the smallest number, we start by placing the smallest digit, which is 4, in the thousands place to ensure it is a 4-digit number. Since we need to make it an even number, the units place must be an even number, so we use 4. Placing 5 in the hundreds place and 7 in the tens place gives us the smallest even 4-digit number, 4579.
0
10234 If you're cheap, you can go 01234