18347 has 4 divisors (see below), whose sum is σ = 20976. Its totient is φ = 15720.

The previous prime is 18341. The next prime is 18353. The reversal of 18347 is 74381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18341) and next prime (18353).

It is a cyclic number.

It is not a de Polignac number, because 18347 - 2¹² = 14251 is a prime.

It is a super-2 number, since 2×18347² = 673224818, which contains 22 as substring.

It is a d-powerful number, because it can be written as 1 + 8³ + 3 + 4⁵ + 7⁵ .

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

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304 + ... + 1317.

It is an arithmetic number, because the mean of its divisors is an integer number (5244).

2¹⁸³⁴⁷ is an apocalyptic number.

18347 is a deficient number, since it is larger than the sum of its proper divisors (2629).

18347 is an equidigital number, since it uses as much as digits as its factorization.

18347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628.

The product of its digits is 672, while the sum is 23.

The square root of 18347 is about 135.4510981868. The cubic root of 18347 is about 26.3747501156.

The spelling of 18347 in words is "eighteen thousand, three hundred forty-seven".