2656866 has 16 divisors (see below), whose sum is σ = 5337504. Its totient is φ = 881664.

The previous prime is 2656861. The next prime is 2656867. The reversal of 2656866 is 6686562.

It is not an unprimeable number, because it can be changed into a prime (2656861) 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, 681 + ... + 2403.

It is an arithmetic number, because the mean of its divisors is an integer number (333594).

2^2656866 is an apocalyptic number.

2656866 is an abundant number, since it is smaller than the sum of its proper divisors (2680638).

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

2656866 is a wasteful number, since it uses less digits than its factorization.

2656866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985.

The product of its digits is 103680, while the sum is 39.

The square root of 2656866 is about 1629.9895705188. The cubic root of 2656866 is about 138.5021612525.

The spelling of 2656866 in words is "two million, six hundred fifty-six thousand, eight hundred sixty-six".