18139422 has 16 divisors (see below), whose sum is σ = 41461632. Its totient is φ = 5182680.

The previous prime is 18139417. The next prime is 18139463. The reversal of 18139422 is 22493181.

It is a self number, because there is not a number n which added to its sum of digits gives 18139422.

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, 215904 + ... + 215987.

It is an arithmetic number, because the mean of its divisors is an integer number (2591352).

Almost surely, 2^18139422 is an apocalyptic number.

18139422 is an abundant number, since it is smaller than the sum of its proper divisors (23322210).

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

18139422 is a wasteful number, since it uses less digits than its factorization.

18139422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431903.

The product of its digits is 3456, while the sum is 30.

The square root of 18139422 is about 4259.0400326834. The cubic root of 18139422 is about 262.7490461830.

The spelling of 18139422 in words is "eighteen million, one hundred thirty-nine thousand, four hundred twenty-two".