18326816 has 48 divisors (see below), whose sum is σ = 38918880. Its totient is φ = 8463360.

The previous prime is 18326813. The next prime is 18326821. The reversal of 18326816 is 61862381.

It is not an unprimeable number, because it can be changed into a prime (18326813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31811 + ... + 32381.

It is an arithmetic number, because the mean of its divisors is an integer number (810810).

Almost surely, 2^18326816 is an apocalyptic number.

18326816 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 18326816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19459440).

18326816 is an abundant number, since it is smaller than the sum of its proper divisors (20592064).

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

18326816 is a wasteful number, since it uses less digits than its factorization.

18326816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 649 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 18326816 is about 4280.9830646710. The cubic root of 18326816 is about 263.6507472281.

The spelling of 18326816 in words is "eighteen million, three hundred twenty-six thousand, eight hundred sixteen".