18038856 has 32 divisors (see below), whose sum is σ = 49197600. Its totient is φ = 5466240.

The previous prime is 18038851. The next prime is 18038857. The reversal of 18038856 is 65883081.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18038851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33901 + ... + 34428.

It is an arithmetic number, because the mean of its divisors is an integer number (1537425).

Almost surely, 2^18038856 is an apocalyptic number.

It is an amenable number.

18038856 is an abundant number, since it is smaller than the sum of its proper divisors (31158744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18038856 is a wasteful number, since it uses less digits than its factorization.

18038856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68349 (or 68345 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18038856 is about 4247.2174420437. The cubic root of 18038856 is about 262.2625807948.

The spelling of 18038856 in words is "eighteen million, thirty-eight thousand, eight hundred fifty-six".