input: from typing import List
  
  def is_armstrong_number(num: int) -> bool:
      """ Check if a given number is an Armstrong number. An Armstrong number is a number that is the sum
      of its own digits each raised to the power of the number of digits.
      >>> is_armstrong_number(153)
      True
      >>> is_armstrong_number(9474)
      True
      >>> is_armstrong_number(1234)
      False
      """
      order = len(str(num))
      sum = 0
      temp = num
      while temp > 0:
          digit = temp % 10
          sum += digit ** order
          temp //= 10
      return num == sum
output:     order = len(str(num))
      sum = 0
      temp = num
      while temp > 0:
          digit = temp % 10
          sum += digit ** order
          temp //= 10
      return num == sum