A Harshad number (also called a Niven number) is a positive integer that is divisible by the sum of its digits. For example, 18 is a Harshad number because its digit sum is 1+8=9, and 18 is divisible by 9. Return false for numbers less than or equal to 0.
Examples:
Input: n = 18
Output: true
Explanation: Digit sum = 1 + 8 = 9, and 18 / 9 = 2 (divisible)
Input: n = 21
Output: true
Explanation: Digit sum = 2 + 1 = 3, and 21 / 3 = 7 (divisible)
Input: n = 19
Output: false
Explanation: Digit sum = 1 + 9 = 10, and 19 is not divisible by 10
Input: n = 1
Output: true
Explanation: Digit sum = 1, and 1 / 1 = 1 (divisible)
Input: n = 12
Output: true
Explanation: Digit sum = 1 + 2 = 3, and 12 / 3 = 4 (divisible)
Apex Code Editor
Welcome to Lightning Challenge!
Create an Account
Sign up to track your progress, earn points, and compete with others. Your solutions will be saved automatically.
Create accountHow It Works
- • Write your solution in the code editor
- • Connect your Salesforce org to test
- • Submit to check if your solution passes
- • Use hints if you get stuck
Contest Alert
🏆 #CodeEveryDay May 2026
Contest runs May 1 - 31. Complete challenges to climb the leaderboard!
Only the 31 daily challenges shown during this contest count toward points. Earlier dailies don't carry over.