18089579 has 4 divisors (see below), whose sum is σ = 18120984. Its totient is φ = 18058176.

The previous prime is 18089563. The next prime is 18089597. The reversal of 18089579 is 97598081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18089579 - 2⁴ = 18089563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18029579) 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, 14822 + ... + 15995.

It is an arithmetic number, because the mean of its divisors is an integer number (4530246).

Almost surely, 2^18089579 is an apocalyptic number.

18089579 is a deficient number, since it is larger than the sum of its proper divisors (31405).

18089579 is an equidigital number, since it uses as much as digits as its factorization.

18089579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31404.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 18089579 is about 4253.1845715887. The cubic root of 18089579 is about 262.5081672440.

The spelling of 18089579 in words is "eighteen million, eighty-nine thousand, five hundred seventy-nine".