18665089 has 4 divisors (see below), whose sum is σ = 18777024. Its totient is φ = 18553156.

The previous prime is 18665077. The next prime is 18665107. The reversal of 18665089 is 98056681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98056681 = 239 ⋅410279.

It is a cyclic number.

It is not a de Polignac number, because 18665089 - 2⁹ = 18664577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18665039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55717 + ... + 56050.

It is an arithmetic number, because the mean of its divisors is an integer number (4694256).

Almost surely, 2^18665089 is an apocalyptic number.

It is an amenable number.

18665089 is a deficient number, since it is larger than the sum of its proper divisors (111935).

18665089 is a wasteful number, since it uses less digits than its factorization.

18665089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111934.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 18665089 is about 4320.3112156418. The cubic root of 18665089 is about 265.2630069517.

The spelling of 18665089 in words is "eighteen million, six hundred sixty-five thousand, eighty-nine".