I believe it is:
987,654
9876543
9876543
987654321
The smallest positive integer six-digit number is 100000.
0
987
9876543
9876543
987654321
9,876,543
Multiples of 12 are even. Start with 999998. It's not divisible by 12. Try 999996. It is divisible by 12. Stop there.
The smallest positive integer six-digit number is 100000.
The greatest possible number is 888... (repeating).
5, or .8 with a three repeating.
0
1,023,456,789
98765