18065689 has 4 divisors (see below), whose sum is σ = 18074320. Its totient is φ = 18057060.

The previous prime is 18065683. The next prime is 18065693. The reversal of 18065689 is 98656081.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18065689 - 2³ = 18065681 is a prime.

It is a super-3 number, since 3×18065689³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18065681) 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, 1042 + ... + 6100.

It is an arithmetic number, because the mean of its divisors is an integer number (4518580).

Almost surely, 2^18065689 is an apocalyptic number.

It is an amenable number.

18065689 is a deficient number, since it is larger than the sum of its proper divisors (8631).

18065689 is an equidigital number, since it uses as much as digits as its factorization.

18065689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8630.

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

The square root of 18065689 is about 4250.3751599124. The cubic root of 18065689 is about 262.3925558768.

The spelling of 18065689 in words is "eighteen million, sixty-five thousand, six hundred eighty-nine".