16856656 has 40 divisors (see below), whose sum is σ = 35790120. Its totient is φ = 7655424.

The previous prime is 16856641. The next prime is 16856657. The reversal of 16856656 is 65665861.

It can be written as a sum of positive squares in 4 ways, for example, as 1175056 + 15681600 = 1084^2 + 3960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16856657) 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, 6820 + ... + 8956.

It is an arithmetic number, because the mean of its divisors is an integer number (894753).

Almost surely, 2^16856656 is an apocalyptic number.

16856656 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 16856656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17895060).

16856656 is an abundant number, since it is smaller than the sum of its proper divisors (18933464).

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

16856656 is a wasteful number, since it uses less digits than its factorization.

16856656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191 (or 2185 counting only the distinct ones).

The product of its digits is 259200, while the sum is 43.

The square root of 16856656 is about 4105.6858136005. The cubic root of 16856656 is about 256.4034166777.

The spelling of 16856656 in words is "sixteen million, eight hundred fifty-six thousand, six hundred fifty-six".