18838879 has 4 divisors (see below), whose sum is σ = 18867384. Its totient is φ = 18810376.

The previous prime is 18838847. The next prime is 18838889. The reversal of 18838879 is 97883881.

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

It is a cyclic number.

It is not a de Polignac number, because 18838879 - 2⁵ = 18838847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18838819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13237 + ... + 14590.

It is an arithmetic number, because the mean of its divisors is an integer number (4716846).

Almost surely, 2^18838879 is an apocalyptic number.

18838879 is a deficient number, since it is larger than the sum of its proper divisors (28505).

18838879 is an equidigital number, since it uses as much as digits as its factorization.

18838879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28504.

The product of its digits is 774144, while the sum is 52.

The square root of 18838879 is about 4340.3777485376. The cubic root of 18838879 is about 266.0837497985.

The spelling of 18838879 in words is "eighteen million, eight hundred thirty-eight thousand, eight hundred seventy-nine".