18490859 has 4 divisors (see below), whose sum is σ = 18518616. Its totient is φ = 18463104.

The previous prime is 18490847. The next prime is 18490891. The reversal of 18490859 is 95809481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95809481 = 307 ⋅312083.

It is a cyclic number.

It is not a de Polignac number, because 18490859 - 2¹² = 18486763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18495859) 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 in 3 ways as a sum of consecutive naturals, for example, 12854 + ... + 14219.

It is an arithmetic number, because the mean of its divisors is an integer number (4629654).

Almost surely, 2^18490859 is an apocalyptic number.

18490859 is a deficient number, since it is larger than the sum of its proper divisors (27757).

18490859 is an equidigital number, since it uses as much as digits as its factorization.

18490859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27756.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18490859 is about 4300.0998825609. The cubic root of 18490859 is about 264.4350561141.

The spelling of 18490859 in words is "eighteen million, four hundred ninety thousand, eight hundred fifty-nine".