18360689 has 4 divisors (see below), whose sum is σ = 18542580. Its totient is φ = 18178800.

The previous prime is 18360659. The next prime is 18360721. The reversal of 18360689 is 98606381.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15864289 + 2496400 = 3983^2 + 1580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18360689 is a prime.

It is a super-2 number, since 2×18360689² = 674229801109442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18360619) 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, 90794 + ... + 90995.

It is an arithmetic number, because the mean of its divisors is an integer number (4635645).

Almost surely, 2^18360689 is an apocalyptic number.

It is an amenable number.

18360689 is a deficient number, since it is larger than the sum of its proper divisors (181891).

18360689 is a wasteful number, since it uses less digits than its factorization.

18360689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181890.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18360689 is about 4284.9374557863. The cubic root of 18360689 is about 263.8130803053.

The spelling of 18360689 in words is "eighteen million, three hundred sixty thousand, six hundred eighty-nine".