18388922 has 16 divisors (see below), whose sum is σ = 29156640. Its totient is φ = 8674128.

The previous prime is 18388879. The next prime is 18388957. The reversal of 18388922 is 22988381.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18388922.

It is an unprimeable number.

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, 9653 + ... + 11399.

It is an arithmetic number, because the mean of its divisors is an integer number (1822290).

Almost surely, 2^18388922 is an apocalyptic number.

18388922 is a deficient number, since it is larger than the sum of its proper divisors (10767718).

18388922 is a wasteful number, since it uses less digits than its factorization.

18388922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045.

The product of its digits is 55296, while the sum is 41.

The square root of 18388922 is about 4288.2306374541. The cubic root of 18388922 is about 263.9482317379.

The spelling of 18388922 in words is "eighteen million, three hundred eighty-eight thousand, nine hundred twenty-two".