2656889 has 2 divisors, whose sum is σ = 2656890. Its totient is φ = 2656888.

The previous prime is 2656883. The next prime is 2656909. The reversal of 2656889 is 9886562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 466489 = 1480^2 + 683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2656889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2656883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328444 + 1328445.

It is an arithmetic number, because the mean of its divisors is an integer number (1328445).

2^2656889 is an apocalyptic number.

It is an amenable number.

2656889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656889 is an equidigital number, since it uses as much as digits as its factorization.

2656889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 2656889 is about 1629.9966257634. The cubic root of 2656889 is about 138.5025609140.

The spelling of 2656889 in words is "two million, six hundred fifty-six thousand, eight hundred eighty-nine".