18668859 has 8 divisors (see below), whose sum is σ = 27154752. Its totient is φ = 11314440.

The previous prime is 18668857. The next prime is 18668861. The reversal of 18668859 is 95886681.

It is an interprime number because it is at equal distance from previous prime (18668857) and next prime (18668861).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18668859 - 2¹ = 18668857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18668857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282829 + ... + 282894.

It is an arithmetic number, because the mean of its divisors is an integer number (3394344).

Almost surely, 2^18668859 is an apocalyptic number.

18668859 is a deficient number, since it is larger than the sum of its proper divisors (8485893).

18668859 is a wasteful number, since it uses less digits than its factorization.

18668859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565737.

The product of its digits is 829440, while the sum is 51.

The square root of 18668859 is about 4320.7475047728. The cubic root of 18668859 is about 265.2808651434.

The spelling of 18668859 in words is "eighteen million, six hundred sixty-eight thousand, eight hundred fifty-nine".