2565440 has 28 divisors (see below), whose sum is σ = 6109716. Its totient is φ = 1026048.

The previous prime is 2565403. The next prime is 2565449. The reversal of 2565440 is 445652.

2565440 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 2 ways, for example, as 1201216 + 1364224 = 1096^2 + 1168^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3689 + ... + 4328.

2^2565440 is an apocalyptic number.

2565440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2565440 is an abundant number, since it is smaller than the sum of its proper divisors (3544276).

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

2565440 is an equidigital number, since it uses as much as digits as its factorization.

2565440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8034 (or 8024 counting only the distinct ones).

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

The square root of 2565440 is about 1601.6990978333. The cubic root of 2565440 is about 136.8949058155.

The spelling of 2565440 in words is "two million, five hundred sixty-five thousand, four hundred forty".