2540565 has 56 divisors (see below), whose sum is σ = 4957848. Its totient is φ = 1244160.

The previous prime is 2540563. The next prime is 2540567. The reversal of 2540565 is 5650452.

It is an interprime number because it is at equal distance from previous prime (2540563) and next prime (2540567).

It can be written as a sum of positive squares in 4 ways, for example, as 88209 + 2452356 = 297^2 + 1566^2 .

It is not a de Polignac number, because 2540565 - 2¹ = 2540563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540563) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 61945 + ... + 61985.

It is an arithmetic number, because the mean of its divisors is an integer number (88533).

2^2540565 is an apocalyptic number.

It is an amenable number.

2540565 is a deficient number, since it is larger than the sum of its proper divisors (2417283).

2540565 is an equidigital number, since it uses as much as digits as its factorization.

2540565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 2540565 is about 1593.9149914597. The cubic root of 2540565 is about 136.4510149071.

The spelling of 2540565 in words is "two million, five hundred forty thousand, five hundred sixty-five".