18147 has 8 divisors (see below), whose sum is σ = 25344. Its totient is φ = 11528.

The previous prime is 18143. The next prime is 18149. The reversal of 18147 is 74181.

18147 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18147 - 2² = 18143 is a prime.

It is an alternating number because its digits alternate between odd and even.

18147 is a lucky number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18147.

It is not an unprimeable number, because it can be changed into a prime (18143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63 + ... + 200.

It is an arithmetic number, because the mean of its divisors is an integer number (3168).

2¹⁸¹⁴⁷ is an apocalyptic number.

18147 is a deficient number, since it is larger than the sum of its proper divisors (7197).

18147 is a wasteful number, since it uses less digits than its factorization.

18147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its digits is 224, while the sum is 21.

The square root of 18147 is about 134.7108013487. The cubic root of 18147 is about 26.2785630132.

The spelling of 18147 in words is "eighteen thousand, one hundred forty-seven".