18023158 has 4 divisors (see below), whose sum is σ = 27034740. Its totient is φ = 9011578.

The previous prime is 18023113. The next prime is 18023167. The reversal of 18023158 is 85132081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85132081 = 29 ⋅2935589.

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, 4505788 + ... + 4505791.

It is an arithmetic number, because the mean of its divisors is an integer number (6758685).

Almost surely, 2^18023158 is an apocalyptic number.

18023158 is a deficient number, since it is larger than the sum of its proper divisors (9011582).

18023158 is an equidigital number, since it uses as much as digits as its factorization.

18023158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9011581.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18023158 is about 4245.3690063409. The cubic root of 18023158 is about 262.1864822362.

It can be divided in two parts, 18023 and 158, that added together give a palindrome (18181).

The spelling of 18023158 in words is "eighteen million, twenty-three thousand, one hundred fifty-eight".