18166238 has 8 divisors (see below), whose sum is σ = 28189080. Its totient is φ = 8769880.

The previous prime is 18166193. The next prime is 18166283. The reversal of 18166238 is 83266181.

It is an interprime number because it is at equal distance from previous prime (18166193) and next prime (18166283).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18166198 and 18166207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156548 + ... + 156663.

It is an arithmetic number, because the mean of its divisors is an integer number (3523635).

Almost surely, 2^18166238 is an apocalyptic number.

18166238 is a deficient number, since it is larger than the sum of its proper divisors (10022842).

18166238 is a wasteful number, since it uses less digits than its factorization.

18166238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313242.

The product of its digits is 13824, while the sum is 35.

The square root of 18166238 is about 4262.1869973055. The cubic root of 18166238 is about 262.8784587820.

The spelling of 18166238 in words is "eighteen million, one hundred sixty-six thousand, two hundred thirty-eight".