2556999 has 6 divisors (see below), whose sum is σ = 3693456. Its totient is φ = 1704660.

The previous prime is 2556997. The next prime is 2557007. The reversal of 2556999 is 9996552.

2556999 is a `hidden beast` number, since 2 + 556 + 9 + 99 = 666.

It is not a de Polignac number, because 2556999 - 2¹ = 2556997 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142047 + ... + 142064.

It is an arithmetic number, because the mean of its divisors is an integer number (615576).

2^2556999 is an apocalyptic number.

2556999 is a deficient number, since it is larger than the sum of its proper divisors (1136457).

2556999 is a wasteful number, since it uses less digits than its factorization.

2556999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284117 (or 284114 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 2556999 is about 1599.0619124974. The cubic root of 2556999 is about 136.7446002723.

The spelling of 2556999 in words is "two million, five hundred fifty-six thousand, nine hundred ninety-nine".