18898 has 8 divisors (see below), whose sum is σ = 30960. Its totient is φ = 8580.

The previous prime is 18869. The next prime is 18899. The reversal of 18898 is 89881.

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 (18899) by changing a digit.

18898 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408 + ... + 451.

It is an arithmetic number, because the mean of its divisors is an integer number (3870).

2¹⁸⁸⁹⁸ is an apocalyptic number.

18898 is a deficient number, since it is larger than the sum of its proper divisors (12062).

18898 is a wasteful number, since it uses less digits than its factorization.

18898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its digits is 4608, while the sum is 34.

The square root of 18898 is about 137.4699967266. The cubic root of 18898 is about 26.6361804382.

The spelling of 18898 in words is "eighteen thousand, eight hundred ninety-eight".