18162238 has 4 divisors (see below), whose sum is σ = 27243360. Its totient is φ = 9081118.

The previous prime is 18162217. The next prime is 18162259. The reversal of 18162238 is 83226181.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18162217) and next prime (18162259).

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 congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4540558 + ... + 4540561.

It is an arithmetic number, because the mean of its divisors is an integer number (6810840).

Almost surely, 2^18162238 is an apocalyptic number.

18162238 is a deficient number, since it is larger than the sum of its proper divisors (9081122).

18162238 is an equidigital number, since it uses as much as digits as its factorization.

18162238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9081121.

The product of its digits is 4608, while the sum is 31.

The square root of 18162238 is about 4261.7177288037. The cubic root of 18162238 is about 262.8591630786.

The spelling of 18162238 in words is "eighteen million, one hundred sixty-two thousand, two hundred thirty-eight".