2556815 has 16 divisors (see below), whose sum is σ = 3187296. Its totient is φ = 1968000.

The previous prime is 2556803. The next prime is 2556821. The reversal of 2556815 is 5186552.

2556815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2556815 - 2⁸ = 2556559 is a prime.

It is a Duffinian number.

Its product of digits (12000) is a multiple of the sum of its prime divisors (250).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25265 + ... + 25365.

It is an arithmetic number, because the mean of its divisors is an integer number (199206).

2^2556815 is an apocalyptic number.

2556815 is a deficient number, since it is larger than the sum of its proper divisors (630481).

2556815 is a wasteful number, since it uses less digits than its factorization.

2556815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its digits is 12000, while the sum is 32.

The square root of 2556815 is about 1599.0043777301. The cubic root of 2556815 is about 136.7413201758.

The spelling of 2556815 in words is "two million, five hundred fifty-six thousand, eight hundred fifteen".