18798 has 16 divisors (see below), whose sum is σ = 40656. Its totient is φ = 5760.

The previous prime is 18797. The next prime is 18803. The reversal of 18798 is 89781.

It is a plaindrome in base 8.

It is a nialpdrome in base 12 and base 13.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18793) 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, 43 + ... + 198.

It is an arithmetic number, because the mean of its divisors is an integer number (2541).

2¹⁸⁷⁹⁸ is an apocalyptic number.

18798 is an abundant number, since it is smaller than the sum of its proper divisors (21858).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20328).

18798 is a wasteful number, since it uses less digits than its factorization.

18798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259.

The product of its digits is 4032, while the sum is 33.

The square root of 18798 is about 137.1057985645. The cubic root of 18798 is about 26.5891149614.

The spelling of 18798 in words is "eighteen thousand, seven hundred ninety-eight".