2440640865 has 32 divisors (see below), whose sum is σ = 4208029056. Its totient is φ = 1200798720.

The previous prime is 2440640843. The next prime is 2440640869. The reversal of 2440640865 is 5680460442.

It is not a de Polignac number, because 2440640865 - 2⁹ = 2440640353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (2440640869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439305 + ... + 444825.

It is an arithmetic number, because the mean of its divisors is an integer number (131500908).

Almost surely, 2^2440640865 is an apocalyptic number.

It is an amenable number.

2440640865 is a deficient number, since it is larger than the sum of its proper divisors (1767388191).

2440640865 is a wasteful number, since it uses less digits than its factorization.

2440640865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7809.

The product of its (nonzero) digits is 184320, while the sum is 39.

The square root of 2440640865 is about 49402.8426813680. The cubic root of 2440640865 is about 1346.3809542859.

The spelling of 2440640865 in words is "two billion, four hundred forty million, six hundred forty thousand, eight hundred sixty-five".