18038812 has 48 divisors (see below), whose sum is σ = 36328320. Its totient is φ = 7761600.

The previous prime is 18038803. The next prime is 18038821. The reversal of 18038812 is 21883081.

It is an interprime number because it is at equal distance from previous prime (18038803) and next prime (18038821).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85387 + ... + 85597.

It is an arithmetic number, because the mean of its divisors is an integer number (756840).

Almost surely, 2^18038812 is an apocalyptic number.

It is an amenable number.

18038812 is an abundant number, since it is smaller than the sum of its proper divisors (18289508).

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

18038812 is a wasteful number, since it uses less digits than its factorization.

18038812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 18038812 is about 4247.2122621786. The cubic root of 18038812 is about 262.2623675595.

The spelling of 18038812 in words is "eighteen million, thirty-eight thousand, eight hundred twelve".