16866816 has 80 divisors (see below), whose sum is σ = 45830400. Its totient is φ = 5511168.

The previous prime is 16866809. The next prime is 16866827. The reversal of 16866816 is 61866861.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121275 + ... + 121413.

It is an arithmetic number, because the mean of its divisors is an integer number (572880).

Almost surely, 2^16866816 is an apocalyptic number.

16866816 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 16866816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22915200).

16866816 is an abundant number, since it is smaller than the sum of its proper divisors (28963584).

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

16866816 is an equidigital number, since it uses as much as digits as its factorization.

16866816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 223 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 16866816 is about 4106.9229357269. The cubic root of 16866816 is about 256.4549202798.

The spelling of 16866816 in words is "sixteen million, eight hundred sixty-six thousand, eight hundred sixteen".