18238923 has 12 divisors (see below), whose sum is σ = 26958360. Its totient is φ = 11876256.

The previous prime is 18238921. The next prime is 18238933. The reversal of 18238923 is 32983281.

It is a happy number.

It is not a de Polignac number, because 18238923 - 2¹ = 18238921 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18238921) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 23178 + ... + 23951.

It is an arithmetic number, because the mean of its divisors is an integer number (2246530).

Almost surely, 2^18238923 is an apocalyptic number.

18238923 is a deficient number, since it is larger than the sum of its proper divisors (8719437).

18238923 is a wasteful number, since it uses less digits than its factorization.

18238923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47178 (or 47175 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18238923 is about 4270.7052110863. The cubic root of 18238923 is about 263.2285935359.

The spelling of 18238923 in words is "eighteen million, two hundred thirty-eight thousand, nine hundred twenty-three".