2556340 has 12 divisors (see below), whose sum is σ = 5368356. Its totient is φ = 1022528.

The previous prime is 2556331. The next prime is 2556373. The reversal of 2556340 is 436552.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 1909924 = 804^2 + 1382^2 .

It is a congruent number.

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, 63889 + ... + 63928.

It is an arithmetic number, because the mean of its divisors is an integer number (447363).

2^2556340 is an apocalyptic number.

2556340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2556340 is an abundant number, since it is smaller than the sum of its proper divisors (2812016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2556340 is a wasteful number, since it uses less digits than its factorization.

2556340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127826 (or 127824 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 2556340 is about 1598.8558409062. The cubic root of 2556340 is about 136.7328518080.

It can be divided in two parts, 25 and 56340, that added together give a palindrome (56365).

The spelling of 2556340 in words is "two million, five hundred fifty-six thousand, three hundred forty".