2556963 has 18 divisors (see below), whose sum is σ = 3902964. Its totient is φ = 1612872.

The previous prime is 2556943. The next prime is 2556977. The reversal of 2556963 is 3696552.

It is not a de Polignac number, because 2556963 - 2⁹ = 2556451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2556913) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2856 + ... + 3642.

2^2556963 is an apocalyptic number.

2556963 is a deficient number, since it is larger than the sum of its proper divisors (1346001).

2556963 is a wasteful number, since it uses less digits than its factorization.

2556963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 809 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 2556963 is about 1599.0506558580. The cubic root of 2556963 is about 136.7439585267.

The spelling of 2556963 in words is "two million, five hundred fifty-six thousand, nine hundred sixty-three".