18553998 has 16 divisors (see below), whose sum is σ = 37376640. Its totient is φ = 6139896.

The previous prime is 18553993. The next prime is 18553999. The reversal of 18553998 is 89935581.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18553991) 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, 10290 + ... + 11957.

It is an arithmetic number, because the mean of its divisors is an integer number (2336040).

Almost surely, 2^18553998 is an apocalyptic number.

18553998 is an abundant number, since it is smaller than the sum of its proper divisors (18822642).

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

18553998 is a wasteful number, since it uses less digits than its factorization.

18553998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22391.

The product of its digits is 388800, while the sum is 48.

The square root of 18553998 is about 4307.4351997447. The cubic root of 18553998 is about 264.7356947047.

The spelling of 18553998 in words is "eighteen million, five hundred fifty-three thousand, nine hundred ninety-eight".