18858913 has 4 divisors (see below), whose sum is σ = 18913300. Its totient is φ = 18804528.

The previous prime is 18858911. The next prime is 18858923. The reversal of 18858913 is 31985881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16224784 + 2634129 = 4028^2 + 1623^2 .

It is a cyclic number.

It is not a de Polignac number, because 18858913 - 2¹ = 18858911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18858913.

It is not an unprimeable number, because it can be changed into a prime (18858911) 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, 26670 + ... + 27367.

It is an arithmetic number, because the mean of its divisors is an integer number (4728325).

Almost surely, 2^18858913 is an apocalyptic number.

It is an amenable number.

18858913 is a deficient number, since it is larger than the sum of its proper divisors (54387).

18858913 is an equidigital number, since it uses as much as digits as its factorization.

18858913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54386.

The product of its digits is 69120, while the sum is 43.

The square root of 18858913 is about 4342.6849989379. The cubic root of 18858913 is about 266.1780376685.

The spelling of 18858913 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred thirteen".