18998898 has 16 divisors (see below), whose sum is σ = 39997920. Its totient is φ = 5999616.

The previous prime is 18998893. The next prime is 18998899. The reversal of 18998898 is 89889981.

It is not an unprimeable number, because it can be changed into a prime (18998893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83215 + ... + 83442.

It is an arithmetic number, because the mean of its divisors is an integer number (2499870).

Almost surely, 2^18998898 is an apocalyptic number.

18998898 is an abundant number, since it is smaller than the sum of its proper divisors (20999022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18998898 is a wasteful number, since it uses less digits than its factorization.

18998898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166681.

The product of its digits is 2985984, while the sum is 60.

The square root of 18998898 is about 4358.7725336383. The cubic root of 18998898 is about 266.8350058626.

The spelling of 18998898 in words is "eighteen million, nine hundred ninety-eight thousand, eight hundred ninety-eight".