18698 has 4 divisors (see below), whose sum is σ = 28050.
Its totient is φ = 9348.
The previous prime is 18691. The next prime is 18701. The reversal of 18698 is 89681.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 12769 + 5929 = 113^2 + 77^2
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (18691) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4673 + ... + 4676.
218698 is an apocalyptic number.
18698 is a deficient number, since it is larger than the sum of its proper divisors (9352).
18698 is an equidigital number, since it uses as much as digits as its factorization.
18698 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9351.
The product of its digits is 3456, while the sum is 32.
The square root of 18698 is about 136.7406303920.
The cubic root of 18698 is about 26.5418822706.
The spelling of 18698 in words is "eighteen thousand, six hundred ninety-eight".