In mathematics, a harshad number (or Niven number) in a given number base is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers in base n are also known as n-harshad (or n-Niven) numbers.
For example, The number 18 is a harshad number in base 10, because the sum of the digits 1 and 8 is 9 (1 + 8 = 9), and 18 is divisible by 9.
Given a number, check whether it is a harshad number or not.
Sample Input:
84
Sample Output:
True
数据结构和算法：初级练习题 #51 – 哈沙德数
哈沙德数是可以在某个固定的进位制中，被各位数字之和（数字和）整除的整数。哈沙德数又称尼云数，是因为伊万·尼云在1997年一个有关数论的会议发表的论文。
若一个数无论在任何进位制中都是哈沙德数，称为全哈沙德数（全尼云数）。只有四个全哈沙德数：1, 2, 4, 6。（12在除八进制以外的进制中均为哈沙德数）
所有在零和进位制的底数之间的数都是哈沙德数。在十进制中，100以内的哈沙德数：1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42, 45, 48, 50, 54, 60, 63, 70, 72, 80, 81, 84, 90, 100。
给定一个整数n，检查它是否是哈沙德数。
输入样例：
84
输出样例：
True
Python Solution
