18038855 has 4 divisors (see below), whose sum is σ = 21646632. Its totient is φ = 14431080.

The previous prime is 18038851. The next prime is 18038857. The reversal of 18038855 is 55883081.

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

It is not a de Polignac number, because 18038855 - 2² = 18038851 is a prime.

It is a super-2 number, since 2×18038855² = 650800579422050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038851) 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, 1803881 + ... + 1803890.

It is an arithmetic number, because the mean of its divisors is an integer number (5411658).

Almost surely, 2^18038855 is an apocalyptic number.

18038855 is a deficient number, since it is larger than the sum of its proper divisors (3607777).

18038855 is an equidigital number, since it uses as much as digits as its factorization.

18038855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607776.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 18038855 is about 4247.2173243195. The cubic root of 18038855 is about 262.2625759486.

The spelling of 18038855 in words is "eighteen million, thirty-eight thousand, eight hundred fifty-five".