18038866 has 8 divisors (see below), whose sum is σ = 28482480. Its totient is φ = 8544708.

The previous prime is 18038861. The next prime is 18038897. The reversal of 18038866 is 66883081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18038861) 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, 237316 + ... + 237391.

It is an arithmetic number, because the mean of its divisors is an integer number (3560310).

Almost surely, 2^18038866 is an apocalyptic number.

18038866 is a deficient number, since it is larger than the sum of its proper divisors (10443614).

18038866 is a wasteful number, since it uses less digits than its factorization.

18038866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474728.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18038866 is about 4247.2186192849. The cubic root of 18038866 is about 262.2626292573.

The spelling of 18038866 in words is "eighteen million, thirty-eight thousand, eight hundred sixty-six".