18922938 has 16 divisors (see below), whose sum is σ = 40072320. Its totient is φ = 5936576.

The previous prime is 18922931. The next prime is 18923039. The reversal of 18922938 is 83922981.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18922938.

It is not an unprimeable number, because it can be changed into a prime (18922931) 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, 92658 + ... + 92861.

It is an arithmetic number, because the mean of its divisors is an integer number (2504520).

Almost surely, 2^18922938 is an apocalyptic number.

18922938 is an abundant number, since it is smaller than the sum of its proper divisors (21149382).

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

18922938 is a wasteful number, since it uses less digits than its factorization.

18922938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185541.

The product of its digits is 62208, while the sum is 42.

The square root of 18922938 is about 4350.0503445363. The cubic root of 18922938 is about 266.4789174972.

The spelling of 18922938 in words is "eighteen million, nine hundred twenty-two thousand, nine hundred thirty-eight".