2656004 has 18 divisors (see below), whose sum is σ = 5034330. Its totient is φ = 1225536.

The previous prime is 2655977. The next prime is 2656009. The reversal of 2656004 is 4006562.

2656004 = T₁₇₂ + T₁₇₃ + ... + T₂₇₅.

It can be written as a sum of positive squares in 3 ways, for example, as 102400 + 2553604 = 320^2 + 1598^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2656009) by changing a digit.

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, 1289 + ... + 2640.

It is an arithmetic number, because the mean of its divisors is an integer number (279685).

2^2656004 is an apocalyptic number.

It is an amenable number.

2656004 is a deficient number, since it is larger than the sum of its proper divisors (2378326).

2656004 is a wasteful number, since it uses less digits than its factorization.

2656004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959 (or 3944 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2656004 is about 1629.7251301983. The cubic root of 2656004 is about 138.4871809741.

The spelling of 2656004 in words is "two million, six hundred fifty-six thousand, four".