18330816 has 112 divisors (see below), whose sum is σ = 57936384. Its totient is φ = 5001216.

The previous prime is 18330803. The next prime is 18330859. The reversal of 18330816 is 61803381.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30616 + ... + 31208.

Almost surely, 2^18330816 is an apocalyptic number.

18330816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18330816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28968192).

18330816 is an abundant number, since it is smaller than the sum of its proper divisors (39605568).

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

18330816 is a wasteful number, since it uses less digits than its factorization.

18330816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18330816 is about 4281.4502215955. The cubic root of 18330816 is about 263.6699272513.

The spelling of 18330816 in words is "eighteen million, three hundred thirty thousand, eight hundred sixteen".