18265938 has 16 divisors (see below), whose sum is σ = 37519680. Its totient is φ = 5924016.

The previous prime is 18265937. The next prime is 18265993. The reversal of 18265938 is 83956281.

It is a self number, because there is not a number n which added to its sum of digits gives 18265938.

It is not an unprimeable number, because it can be changed into a prime (18265931) 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 7 ways as a sum of consecutive naturals, for example, 40918 + ... + 41361.

It is an arithmetic number, because the mean of its divisors is an integer number (2344980).

Almost surely, 2^18265938 is an apocalyptic number.

18265938 is an abundant number, since it is smaller than the sum of its proper divisors (19253742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18265938 is a wasteful number, since it uses less digits than its factorization.

18265938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82321.

The product of its digits is 103680, while the sum is 42.

The square root of 18265938 is about 4273.8668673696. The cubic root of 18265938 is about 263.3584917835.

The spelling of 18265938 in words is "eighteen million, two hundred sixty-five thousand, nine hundred thirty-eight".