2556004 has 18 divisors (see below), whose sum is σ = 4917542. Its totient is φ = 1161600.

The previous prime is 2555989. The next prime is 2556011. The reversal of 2556004 is 4006552.

2556004 = T₄₇₁ + T₄₇₂ + ... + T₄₉₂.

2556004 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1742400 + 813604 = 1320^2 + 902^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2157 + ... + 3124.

2^2556004 is an apocalyptic number.

It is an amenable number.

2556004 is a deficient number, since it is larger than the sum of its proper divisors (2361538).

2556004 is a wasteful number, since it uses less digits than its factorization.

2556004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5307 (or 5294 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 2556004 is about 1598.7507623141. The cubic root of 2556004 is about 136.7268609185.

The spelling of 2556004 in words is "two million, five hundred fifty-six thousand, four".