Assuming whole numbers and a leading zero does not count: 10,234,567
987654321
10234567
4321
There are twelve possible solutions using the rule you stated.
The smallest possible 9 digit number (assuming negatives are not allowed) is 102,345,678 in which 5 is in the thousands' place.
987654321
10234567
9,876,543
4321
There are twelve possible solutions using the rule you stated.
98765432
The smallest possible 9 digit number (assuming negatives are not allowed) is 102,345,678 in which 5 is in the thousands' place.
123,456,789
9876543
9876543
It is 98765.
The least possible integer is -98765432. The least possible positive integer is 10234567.