18618859 has 16 divisors (see below), whose sum is σ = 22776768. Its totient is φ = 14856192.

The previous prime is 18618857. The next prime is 18618863. The reversal of 18618859 is 95881681.

It is a cyclic number.

It is not a de Polignac number, because 18618859 - 2¹ = 18618857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18618857) 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 15 ways as a sum of consecutive naturals, for example, 10737 + ... + 12349.

It is an arithmetic number, because the mean of its divisors is an integer number (1423548).

Almost surely, 2^18618859 is an apocalyptic number.

18618859 is a deficient number, since it is larger than the sum of its proper divisors (4157909).

18618859 is a wasteful number, since it uses less digits than its factorization.

18618859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734.

The product of its digits is 138240, while the sum is 46.

The square root of 18618859 is about 4314.9575895946. The cubic root of 18618859 is about 265.0438232972.

The spelling of 18618859 in words is "eighteen million, six hundred eighteen thousand, eight hundred fifty-nine".