2556789 has 4 divisors (see below), whose sum is σ = 3409056. Its totient is φ = 1704524.

The previous prime is 2556761. The next prime is 2556791. The reversal of 2556789 is 9876552.

2556789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2556789 - 2⁷ = 2556661 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 2556789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556739) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 426129 + ... + 426134.

It is an arithmetic number, because the mean of its divisors is an integer number (852264).

2^2556789 is an apocalyptic number.

It is an amenable number.

2556789 is a deficient number, since it is larger than the sum of its proper divisors (852267).

2556789 is an equidigital number, since it uses as much as digits as its factorization.

2556789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852266.

The product of its digits is 151200, while the sum is 42.

The square root of 2556789 is about 1598.9962476504. The cubic root of 2556789 is about 136.7408566713.

The spelling of 2556789 in words is "two million, five hundred fifty-six thousand, seven hundred eighty-nine".