18089657 has 4 divisors (see below), whose sum is σ = 18318720. Its totient is φ = 17860596.

The previous prime is 18089623. The next prime is 18089677. The reversal of 18089657 is 75698081.

It is a happy number.

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: 75698081 = 1549 ⋅48869.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18089657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18089677) 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, 114413 + ... + 114570.

It is an arithmetic number, because the mean of its divisors is an integer number (4579680).

Almost surely, 2^18089657 is an apocalyptic number.

It is an amenable number.

18089657 is a deficient number, since it is larger than the sum of its proper divisors (229063).

18089657 is an equidigital number, since it uses as much as digits as its factorization.

18089657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229062.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18089657 is about 4253.1937411785. The cubic root of 18089657 is about 262.5085445442.

The spelling of 18089657 in words is "eighteen million, eighty-nine thousand, six hundred fifty-seven".