18338849 has 8 divisors (see below), whose sum is σ = 18847752. Its totient is φ = 17832960.

The previous prime is 18338833. The next prime is 18338867. The reversal of 18338849 is 94883381.

It can be written as a sum of positive squares in 4 ways, for example, as 640000 + 17698849 = 800^2 + 4207^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18338849 - 2⁴ = 18338833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18338809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17237 + ... + 18269.

It is an arithmetic number, because the mean of its divisors is an integer number (2355969).

Almost surely, 2^18338849 is an apocalyptic number.

It is an amenable number.

18338849 is a deficient number, since it is larger than the sum of its proper divisors (508903).

18338849 is a wasteful number, since it uses less digits than its factorization.

18338849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507.

The product of its digits is 165888, while the sum is 44.

The square root of 18338849 is about 4282.3882355527. The cubic root of 18338849 is about 263.7084371065.

The spelling of 18338849 in words is "eighteen million, three hundred thirty-eight thousand, eight hundred forty-nine".