18816816 has 40 divisors (see below), whose sum is σ = 49344064. Its totient is φ = 6177600.

The previous prime is 18816793. The next prime is 18816823. The reversal of 18816816 is 61861881.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291 + ... + 6141.

Almost surely, 2^18816816 is an apocalyptic number.

18816816 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 18816816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24672032).

18816816 is an abundant number, since it is smaller than the sum of its proper divisors (30527248).

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

18816816 is a wasteful number, since it uses less digits than its factorization.

18816816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929 (or 5923 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 18816816 is about 4337.8354048995. The cubic root of 18816816 is about 265.9798352815.

The spelling of 18816816 in words is "eighteen million, eight hundred sixteen thousand, eight hundred sixteen".