2656689 has 16 divisors (see below), whose sum is σ = 4106112. Its totient is φ = 1496448.

The previous prime is 2656681. The next prime is 2656699. The reversal of 2656689 is 9866562.

It is not a de Polignac number, because 2656689 - 2³ = 2656681 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2656689.

It is not an unprimeable number, because it can be changed into a prime (2656681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 667 + ... + 2399.

It is an arithmetic number, because the mean of its divisors is an integer number (256632).

2^2656689 is an apocalyptic number.

It is an amenable number.

2656689 is a deficient number, since it is larger than the sum of its proper divisors (1449423).

2656689 is a wasteful number, since it uses less digits than its factorization.

2656689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816.

The product of its digits is 155520, while the sum is 42.

The square root of 2656689 is about 1629.9352747885. The cubic root of 2656689 is about 138.4990855201.

The spelling of 2656689 in words is "two million, six hundred fifty-six thousand, six hundred eighty-nine".