18166027 has 4 divisors (see below), whose sum is σ = 19817496. Its totient is φ = 16514560.

The previous prime is 18166019. The next prime is 18166037. The reversal of 18166027 is 72066181.

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 18166027 - 2³ = 18166019 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 18166027.

It is not an unprimeable number, because it can be changed into a prime (18166037) 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, 825718 + ... + 825739.

It is an arithmetic number, because the mean of its divisors is an integer number (4954374).

Almost surely, 2^18166027 is an apocalyptic number.

18166027 is a deficient number, since it is larger than the sum of its proper divisors (1651469).

18166027 is a wasteful number, since it uses less digits than its factorization.

18166027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651468.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18166027 is about 4262.1622446829. The cubic root of 18166027 is about 262.8774410044.

The spelling of 18166027 in words is "eighteen million, one hundred sixty-six thousand, twenty-seven".