# Python Program to check Armstrong Number

Given a number x, determine whether the given number is Armstrong number or not. A positive integer of n digits is called an Armstrong number of order n (order is number of digits) if.

```abcd... = pow(a,n) + pow(b,n) + pow(c,n) + pow(d,n) + ....
```

Example:

```Input : 153
Output : Yes
153 is an Armstrong number.
1*1*1 + 5*5*5 + 3*3*3 = 153

Input : 120
Output : No
120 is not a Armstrong number.
1*1*1 + 2*2*2 + 0*0*0 = 9

Input : 1253
Output : No
1253 is not a Armstrong Number
1*1*1*1 + 2*2*2*2 + 5*5*5*5 + 3*3*3*3 = 723

Input : 1634
Output : Yes
1*1*1*1 + 6*6*6*6 + 3*3*3*3 + 4*4*4*4 = 1634
```

## Python

 `# Python program to determine whether the number is ``# Armstrong number or not `` ``# Function to calculate x raised to the power y ``def` `power(x, y): ``    ``if` `y``=``=``0``: ``        ``return` `1``    ``if` `y``%``2``=``=``0``: ``        ``return` `power(x, y``/``2``)``*``power(x, y``/``2``) ``    ``return` `x``*``power(x, y``/``2``)``*``power(x, y``/``2``) `` ``# Function to calculate order of the number ``def` `order(x): `` ``    ``# variable to store of the number ``    ``n ``=` `0``    ``while` `(x!``=``0``): ``        ``n ``=` `n``+``1``        ``x ``=` `x``/``10``    ``return` `n `` ``# Function to check whether the given number is ``# Armstrong number or not ``def` `isArmstrong (x): ``    ``n ``=` `order(x) ``    ``temp ``=` `x ``    ``sum1 ``=` `0``    ``while` `(temp!``=``0``): ``        ``r ``=` `temp``%``10``        ``sum1 ``=` `sum1 ``+` `power(r, n) ``        ``temp ``=` `temp``/``10`` ``    ``# If condition satisfies ``    ``return` `(sum1 ``=``=` `x) `` `` ``# Driver Program ``x ``=` `153``print``(isArmstrong(x)) ``x ``=` `1253``print``(isArmstrong(x)) `