Is amstrong number

#1

i did not get full marks in this ques please tell me my mistake

#2

@Aarti.com
In number theory, a armstrong number in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.
1^4+6^4+3^4+4^4= 1634 so 1634 is an armstrong number .