18038339 has 4 divisors (see below), whose sum is σ = 19678200. Its totient is φ = 16398480.

The previous prime is 18038329. The next prime is 18038357. The reversal of 18038339 is 93383081.

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 18038339 - 2⁴ = 18038323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18038299 and 18038308.

It is not an unprimeable number, because it can be changed into a prime (18038329) 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, 819914 + ... + 819935.

It is an arithmetic number, because the mean of its divisors is an integer number (4919550).

Almost surely, 2^18038339 is an apocalyptic number.

18038339 is a deficient number, since it is larger than the sum of its proper divisors (1639861).

18038339 is a wasteful number, since it uses less digits than its factorization.

18038339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639860.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 18038339 is about 4247.1565782297. The cubic root of 18038339 is about 262.2600752581.

The spelling of 18038339 in words is "eighteen million, thirty-eight thousand, three hundred thirty-nine".