18238764 has 24 divisors (see below), whose sum is σ = 43158528. Its totient is φ = 5993680.

The previous prime is 18238711. The next prime is 18238771. The reversal of 18238764 is 46783281.

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 in 7 ways as a sum of consecutive naturals, for example, 9852 + ... + 11555.

It is an arithmetic number, because the mean of its divisors is an integer number (1798272).

Almost surely, 2^18238764 is an apocalyptic number.

It is an amenable number.

18238764 is an abundant number, since it is smaller than the sum of its proper divisors (24919764).

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

18238764 is a wasteful number, since it uses less digits than its factorization.

18238764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21485 (or 21483 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 18238764 is about 4270.6865958532. The cubic root of 18238764 is about 263.2278286247.

The spelling of 18238764 in words is "eighteen million, two hundred thirty-eight thousand, seven hundred sixty-four".