2440656409 has 9 divisors (see below), whose sum is σ = 2466365727. Its totient is φ = 2415213864.

The previous prime is 2440656397. The next prime is 2440656433. The reversal of 2440656409 is 9046560442.

It is a happy number.

The square root of 2440656409 is 49403.

It is a perfect power (a square), and thus also a powerful number.

2440656409 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 only one way, i.e., 576144009 + 1864512400 = 24003^2 + 43180^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2440656409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2440656469) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6273987 + ... + 6274375.

Almost surely, 2^2440656409 is an apocalyptic number.

2440656409 is the 49403-rd square number.

2440656409 is the 24702-nd centered octagonal number.

It is an amenable number.

2440656409 is a deficient number, since it is larger than the sum of its proper divisors (25709318).

2440656409 is an frugal number, since it uses more digits than its factorization.

2440656409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The cubic root of 2440656409 is about 1346.3838125654.

The spelling of 2440656409 in words is "two billion, four hundred forty million, six hundred fifty-six thousand, four hundred nine".