Which no is odd one out from 1553 2137 1892 6397 4085 3649 2464 4585 4868 4276?

Answer 1

This question, as with most "odd one out" questions, requires you to second guess what was in the mind of the person who set the question.

Here are some possible answers:

1553: the only number less than 1600 = 402

1892: the only number with a digital root of 2

6397: the only number greater than 5000

3649: the only number with 4 factors

2464: the only number with 24 factors

4276: the only number with a digital root of 1.

That is six candidates out of the ten. Take your pick! Given more time, I am sure I could find good mathematical reasons why the remaining 4 are odd ones out.