18978622 has 8 divisors (see below), whose sum is σ = 30657816. Its totient is φ = 8759352.

The previous prime is 18978601. The next prime is 18978637. The reversal of 18978622 is 22687981.

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, 364948 + ... + 364999.

It is an arithmetic number, because the mean of its divisors is an integer number (3832227).

Almost surely, 2^18978622 is an apocalyptic number.

18978622 is a deficient number, since it is larger than the sum of its proper divisors (11679194).

18978622 is a wasteful number, since it uses less digits than its factorization.

18978622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729962.

The product of its digits is 96768, while the sum is 43.

The square root of 18978622 is about 4356.4460285880. The cubic root of 18978622 is about 266.7400482077.

It can be divided in two parts, 18978 and 622, that added together give a square (19600 = 140²).

The spelling of 18978622 in words is "eighteen million, nine hundred seventy-eight thousand, six hundred twenty-two".