18858859 has 4 divisors (see below), whose sum is σ = 18867616. Its totient is φ = 18850104.

The previous prime is 18858841. The next prime is 18858871. The reversal of 18858859 is 95885881.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18858859 - 2⁷ = 18858731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18858839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357 + ... + 6289.

It is an arithmetic number, because the mean of its divisors is an integer number (4716904).

Almost surely, 2^18858859 is an apocalyptic number.

18858859 is a deficient number, since it is larger than the sum of its proper divisors (8757).

18858859 is an equidigital number, since it uses as much as digits as its factorization.

18858859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8756.

The product of its digits is 921600, while the sum is 52.

The square root of 18858859 is about 4342.6787815817. The cubic root of 18858859 is about 266.1777836131.

The spelling of 18858859 in words is "eighteen million, eight hundred fifty-eight thousand, eight hundred fifty-nine".