18673859 has 2 divisors, whose sum is σ = 18673860. Its totient is φ = 18673858.

The previous prime is 18673849. The next prime is 18673867. The reversal of 18673859 is 95837681.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (95837681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18673859 - 2⁴ = 18673843 is a prime.

It is not a weakly prime, because it can be changed into another prime (18673849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336929 + 9336930.

It is an arithmetic number, because the mean of its divisors is an integer number (9336930).

Almost surely, 2^18673859 is an apocalyptic number.

18673859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18673859 is an equidigital number, since it uses as much as digits as its factorization.

18673859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 18673859 is about 4321.3260696226. The cubic root of 18673859 is about 265.3045460395.

The spelling of 18673859 in words is "eighteen million, six hundred seventy-three thousand, eight hundred fifty-nine".