18979418 has 8 divisors (see below), whose sum is σ = 28936020. Its totient is φ = 9334080.

The previous prime is 18979391. The next prime is 18979421. The reversal of 18979418 is 81497981.

It can be written as a sum of positive squares in 2 ways, for example, as 13564489 + 5414929 = 3683^2 + 2327^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 77663 + ... + 77906.

Almost surely, 2^18979418 is an apocalyptic number.

18979418 is a deficient number, since it is larger than the sum of its proper divisors (9956602).

18979418 is a wasteful number, since it uses less digits than its factorization.

18979418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155632.

The product of its digits is 145152, while the sum is 47.

The square root of 18979418 is about 4356.5373865032. The cubic root of 18979418 is about 266.7437773529.

The spelling of 18979418 in words is "eighteen million, nine hundred seventy-nine thousand, four hundred eighteen".