18939222 has 12 divisors (see below), whose sum is σ = 41035020. Its totient is φ = 6313068.

The previous prime is 18939211. The next prime is 18939247. The reversal of 18939222 is 22293981.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 526072 + ... + 526107.

It is an arithmetic number, because the mean of its divisors is an integer number (3419585).

Almost surely, 2^18939222 is an apocalyptic number.

18939222 is an abundant number, since it is smaller than the sum of its proper divisors (22095798).

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

18939222 is a wasteful number, since it uses less digits than its factorization.

18939222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052187 (or 1052184 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 18939222 is about 4351.9216445152. The cubic root of 18939222 is about 266.5553344285. Note that the first 3 decimals are identical.

The spelling of 18939222 in words is "eighteen million, nine hundred thirty-nine thousand, two hundred twenty-two".