18422638 has 8 divisors (see below), whose sum is σ = 29759688. Its totient is φ = 8502744.

The previous prime is 18422629. The next prime is 18422659. The reversal of 18422638 is 83622481.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 354256 + ... + 354307.

It is an arithmetic number, because the mean of its divisors is an integer number (3719961).

Almost surely, 2^18422638 is an apocalyptic number.

18422638 is a deficient number, since it is larger than the sum of its proper divisors (11337050).

18422638 is a wasteful number, since it uses less digits than its factorization.

18422638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708578.

The product of its digits is 18432, while the sum is 34.

The square root of 18422638 is about 4292.1600622530. The cubic root of 18422638 is about 264.1094491851.

It can be divided in two parts, 184 and 22638, that added together give a palindrome (22822).

The spelling of 18422638 in words is "eighteen million, four hundred twenty-two thousand, six hundred thirty-eight".