18899 has 2 divisors, whose sum is σ = 18900.
Its totient is φ = 18898.
The previous prime is 18869. The next prime is 18911. The reversal of 18899 is 99881.
It is a happy number.
It is a strong prime.
It is an emirp because it is prime and its reverse (99881) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-18899 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a plaindrome in base 10 and base 15.
It is not a weakly prime, because it can be changed into another prime (18839) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449 + 9450.
It is an arithmetic number, because the mean of its divisors is an integer number (9450).
218899 is an apocalyptic number.
18899 is a deficient number, since it is larger than the sum of its proper divisors (1).
18899 is an equidigital number, since it uses as much as digits as its factorization.
18899 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5184, while the sum is 35.
The square root of 18899 is about 137.4736338357.
The cubic root of 18899 is about 26.6366502535.
The spelling of 18899 in words is "eighteen thousand, eight hundred ninety-nine".