2540665 has 8 divisors (see below), whose sum is σ = 3071880. Its totient is φ = 2017152.

The previous prime is 2540663. The next prime is 2540677. The reversal of 2540665 is 5660452.

2540665 is digitally balanced in base 2, 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 4 ways, for example, as 147456 + 2393209 = 384^2 + 1547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2540665 - 2¹ = 2540663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2540663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1170 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (383985).

2^2540665 is an apocalyptic number.

It is an amenable number.

2540665 is a deficient number, since it is larger than the sum of its proper divisors (531215).

2540665 is a wasteful number, since it uses less digits than its factorization.

2540665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3851.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2540665 is about 1593.9463604526. The cubic root of 2540665 is about 136.4528051811.

The spelling of 2540665 in words is "two million, five hundred forty thousand, six hundred sixty-five".