18978898 has 8 divisors (see below), whose sum is σ = 28519920. Its totient is φ = 9472260.

The previous prime is 18978893. The next prime is 18978901. The reversal of 18978898 is 89887981.

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

It is not an unprimeable number, because it can be changed into a prime (18978893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7168 + ... + 9451.

It is an arithmetic number, because the mean of its divisors is an integer number (3564990).

Almost surely, 2^18978898 is an apocalyptic number.

18978898 is a deficient number, since it is larger than the sum of its proper divisors (9541022).

18978898 is a wasteful number, since it uses less digits than its factorization.

18978898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17192.

The product of its digits is 2322432, while the sum is 58.

The square root of 18978898 is about 4356.4777056700. The cubic root of 18978898 is about 266.7413412397.

The spelling of 18978898 in words is "eighteen million, nine hundred seventy-eight thousand, eight hundred ninety-eight".