18939422 has 4 divisors (see below), whose sum is σ = 28409136. Its totient is φ = 9469710.

The previous prime is 18939421. The next prime is 18939439. The reversal of 18939422 is 22493981.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939421) 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 as a sum of consecutive naturals, namely, 4734854 + ... + 4734857.

It is an arithmetic number, because the mean of its divisors is an integer number (7102284).

Almost surely, 2^18939422 is an apocalyptic number.

18939422 is a deficient number, since it is larger than the sum of its proper divisors (9469714).

18939422 is an equidigital number, since it uses as much as digits as its factorization.

18939422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9469713.

The product of its digits is 31104, while the sum is 38.

The square root of 18939422 is about 4351.9446228094. The cubic root of 18939422 is about 266.5562727085.

The spelling of 18939422 in words is "eighteen million, nine hundred thirty-nine thousand, four hundred twenty-two".