2556039 has 4 divisors (see below), whose sum is σ = 3408056. Its totient is φ = 1704024.

The previous prime is 2556023. The next prime is 2556041. The reversal of 2556039 is 9306552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2556039 - 2⁴ = 2556023 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2555997 and 2556015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426004 + ... + 426009.

It is an arithmetic number, because the mean of its divisors is an integer number (852014).

2^2556039 is an apocalyptic number.

2556039 is a deficient number, since it is larger than the sum of its proper divisors (852017).

2556039 is an equidigital number, since it uses as much as digits as its factorization.

2556039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852016.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 2556039 is about 1598.7617083230. The cubic root of 2556039 is about 136.7274849940.

The spelling of 2556039 in words is "two million, five hundred fifty-six thousand, thirty-nine".