18897679438 has 8 divisors (see below), whose sum is σ = 30923475480. Its totient is φ = 8589854280.

The previous prime is 18897679379. The next prime is 18897679457. The reversal of 18897679438 is 83497679881.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429492693 + ... + 429492736.

It is an arithmetic number, because the mean of its divisors is an integer number (3865434435).

Almost surely, 2^18897679438 is an apocalyptic number.

18897679438 is a deficient number, since it is larger than the sum of its proper divisors (12025796042).

18897679438 is a wasteful number, since it uses less digits than its factorization.

18897679438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858985442.

The product of its digits is 146313216, while the sum is 70.

The spelling of 18897679438 in words is "eighteen billion, eight hundred ninety-seven million, six hundred seventy-nine thousand, four hundred thirty-eight".