18089663 has 4 divisors (see below), whose sum is σ = 18175608. Its totient is φ = 18003720.

The previous prime is 18089623. The next prime is 18089677. The reversal of 18089663 is 36698081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36698081 = 7 ⋅5242583.

It is a cyclic number.

It is not a de Polignac number, because 18089663 - 2¹⁸ = 17827519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18089663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089623) 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, 42656 + ... + 43077.

It is an arithmetic number, because the mean of its divisors is an integer number (4543902).

Almost surely, 2^18089663 is an apocalyptic number.

18089663 is a deficient number, since it is larger than the sum of its proper divisors (85945).

18089663 is an equidigital number, since it uses as much as digits as its factorization.

18089663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85944.

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

The square root of 18089663 is about 4253.1944465307. The cubic root of 18089663 is about 262.5085735673.

The spelling of 18089663 in words is "eighteen million, eighty-nine thousand, six hundred sixty-three".