2556388 has 12 divisors (see below), whose sum is σ = 4547452. Its totient is φ = 1257120.

The previous prime is 2556373. The next prime is 2556397. The reversal of 2556388 is 8836552.

It can be written as a sum of positive squares in 2 ways, for example, as 861184 + 1695204 = 928^2 + 1302^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4995 + ... + 5482.

2^2556388 is an apocalyptic number.

It is an amenable number.

2556388 is a deficient number, since it is larger than the sum of its proper divisors (1991064).

2556388 is a wasteful number, since it uses less digits than its factorization.

2556388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542 (or 10540 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 2556388 is about 1598.8708515699. The cubic root of 2556388 is about 136.7337076065.

It can be divided in two parts, 25563 and 88, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2556388 in words is "two million, five hundred fifty-six thousand, three hundred eighty-eight".