18675859 has 2 divisors, whose sum is σ = 18675860.
Its totient is φ = 18675858.
The previous prime is 18675851. The next prime is 18675883. The reversal of 18675859 is 95857681.
It is a weak prime.
It is an emirp because it is prime and its reverse (95857681) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18675859 - 23 = 18675851 is a prime.
It is not a weakly prime, because it can be changed into another prime (18675851) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9337929 + 9337930.
It is an arithmetic number, because the mean of its divisors is an integer number (9337930).
Almost surely, 218675859 is an apocalyptic number.
18675859 is a deficient number, since it is larger than the sum of its proper divisors (1).
18675859 is an equidigital number, since it uses as much as digits as its factorization.
18675859 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 604800, while the sum is 49.
The square root of 18675859 is about 4321.5574738744.
The cubic root of 18675859 is about 265.3140172143.
The spelling of 18675859 in words is "eighteen million, six hundred seventy-five thousand, eight hundred fifty-nine".