18478038 has 16 divisors (see below), whose sum is σ = 37018800. Its totient is φ = 6148896.

The previous prime is 18477989. The next prime is 18478063. The reversal of 18478038 is 83087481.

It is a junction number, because it is equal to n+sod(n) for n = 18477987 and 18478005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1788 + ... + 6336.

It is an arithmetic number, because the mean of its divisors is an integer number (2313675).

Almost surely, 2^18478038 is an apocalyptic number.

18478038 is an abundant number, since it is smaller than the sum of its proper divisors (18540762).

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

18478038 is a wasteful number, since it uses less digits than its factorization.

18478038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 18478038 is about 4298.6088447310. The cubic root of 18478038 is about 264.3739249044.

The spelling of 18478038 in words is "eighteen million, four hundred seventy-eight thousand, thirty-eight".