18557089 has 4 divisors (see below), whose sum is σ = 18579456. Its totient is φ = 18534724.

The previous prime is 18557087. The next prime is 18557101. The reversal of 18557089 is 98075581.

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.

It is a cyclic number.

It is not a de Polignac number, because 18557089 - 2¹ = 18557087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18557087) 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, 9889 + ... + 11614.

It is an arithmetic number, because the mean of its divisors is an integer number (4644864).

Almost surely, 2^18557089 is an apocalyptic number.

It is an amenable number.

18557089 is a deficient number, since it is larger than the sum of its proper divisors (22367).

18557089 is an equidigital number, since it uses as much as digits as its factorization.

18557089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22366.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 18557089 is about 4307.7939830034. The cubic root of 18557089 is about 264.7503950871.

The spelling of 18557089 in words is "eighteen million, five hundred fifty-seven thousand, eighty-nine".