18038318 has 16 divisors (see below), whose sum is σ = 27869184. Its totient is φ = 8751960.

The previous prime is 18038299. The next prime is 18038323. The reversal of 18038318 is 81383081.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11183 + ... + 12693.

It is an arithmetic number, because the mean of its divisors is an integer number (1741824).

Almost surely, 2^18038318 is an apocalyptic number.

18038318 is a deficient number, since it is larger than the sum of its proper divisors (9830866).

18038318 is a wasteful number, since it uses less digits than its factorization.

18038318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18038318 is about 4247.1541059867. The cubic root of 18038318 is about 262.2599734848.

The spelling of 18038318 in words is "eighteen million, thirty-eight thousand, three hundred eighteen".