18998025 has 12 divisors (see below), whose sum is σ = 31410192. Its totient is φ = 10132240.

The previous prime is 18997997. The next prime is 18998033. The reversal of 18998025 is 52089981.

It is a happy number.

It is not a de Polignac number, because 18998025 - 2⁷ = 18997897 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126579 + ... + 126728.

It is an arithmetic number, because the mean of its divisors is an integer number (2617516).

Almost surely, 2^18998025 is an apocalyptic number.

18998025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18998025 is a deficient number, since it is larger than the sum of its proper divisors (12412167).

18998025 is a wasteful number, since it uses less digits than its factorization.

18998025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253320 (or 253315 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 18998025 is about 4358.6723896159. The cubic root of 18998025 is about 266.8309187742.

The spelling of 18998025 in words is "eighteen million, nine hundred ninety-eight thousand, twenty-five".