18885859 has 4 divisors (see below), whose sum is σ = 18968560. Its totient is φ = 18803160.

The previous prime is 18885857. The next prime is 18885883. The reversal of 18885859 is 95858881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95858881 = 661 ⋅145021.

It is a cyclic number.

It is not a de Polignac number, because 18885859 - 2¹ = 18885857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18885857) 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, 41007 + ... + 41464.

It is an arithmetic number, because the mean of its divisors is an integer number (4742140).

Almost surely, 2^18885859 is an apocalyptic number.

18885859 is a deficient number, since it is larger than the sum of its proper divisors (82701).

18885859 is an equidigital number, since it uses as much as digits as its factorization.

18885859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82700.

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

The square root of 18885859 is about 4345.7863500177. The cubic root of 18885859 is about 266.3047508761.

The spelling of 18885859 in words is "eighteen million, eight hundred eighty-five thousand, eight hundred fifty-nine".