2556404 has 24 divisors (see below), whose sum is σ = 4800768. Its totient is φ = 1188000.

The previous prime is 2556403. The next prime is 2556419. The reversal of 2556404 is 4046552.

It is a super-2 number, since 2×2556404² = 13070402822432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3029 + ... + 3779.

It is an arithmetic number, because the mean of its divisors is an integer number (200032).

2^2556404 is an apocalyptic number.

It is an amenable number.

2556404 is a deficient number, since it is larger than the sum of its proper divisors (2244364).

2556404 is a wasteful number, since it uses less digits than its factorization.

2556404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 2556404 is about 1598.8758550932. The cubic root of 2556404 is about 136.7339928703.

The spelling of 2556404 in words is "two million, five hundred fifty-six thousand, four hundred four".