1."What's that new security alarm code number again, Sean?" Maya asked. "I can't remember exactly," Sean replied. "But I know it's six digits long, and it's the same as our old one if its second half is shifted to in front of its first half, and the funny thing is that it's exactly six times our old number." What was their old number?

Old number was 243815

Old number was 277549

Old number was 142857