01.0.918The number eighteen (18) is a composite number. It is the product of the prime numbers 2 and 3, so its prime factorization is 2 x 3. 18 is the smallest number that is divisible by both 2 and 3. It is an even number and a deficient number. The sum of the proper divisors of 18 is 13, which is less than 18 itself. 18 is also a Harshad number, which means that it is divisible by the sum of its digits. The sum of the digits of 18 is 9, and 18 is divisible by 9. 18 is a pronic number, which means that it is the product of two consecutive integers. In this case, 18 is the product of 6 and 3.Prime Factorization: 2 x 3
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Divisibility:
- Divisible by 2 and 3
- Even number
Deficient Number:
- Sum of proper divisors (13) is less than the number itself (18)
Harshad Number:
- Divisible by the sum of its digits (9)
Pronic Number:
- Product of two consecutive integers (6 and 3)
Additional Properties:
- Least common multiple (LCM) with 2: 18
- Greatest common factor (GCF) with 3: 3Prime Factorization: 2² x 7
Divisibility:
- Divisible by 2 and 7
- Even number
Perfect Number:
- Sum of proper divisors (28) is equal to the number itself (28)
Odd Number:
Additional Properties:
- Least common multiple (LCM) with 3: 84
- Greatest common factor (GCF) with 14: 7
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