18038313 has 12 divisors (see below), whose sum is σ = 26093808. Its totient is φ = 12007800.

The previous prime is 18038299. The next prime is 18038323. The reversal of 18038313 is 31383081.

It is not a de Polignac number, because 18038313 - 2⁵ = 18038281 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18038323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8506 + ... + 10412.

It is an arithmetic number, because the mean of its divisors is an integer number (2174484).

Almost surely, 2^18038313 is an apocalyptic number.

It is an amenable number.

18038313 is a deficient number, since it is larger than the sum of its proper divisors (8055495).

18038313 is a wasteful number, since it uses less digits than its factorization.

18038313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964 (or 2961 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18038313 is about 4247.1535173572. The cubic root of 18038313 is about 262.2599492530.

The spelling of 18038313 in words is "eighteen million, thirty-eight thousand, three hundred thirteen".