3995640409 has 4 divisors (see below), whose sum is σ = 3996759780. Its totient is φ = 3994521040.

The previous prime is 3995640391. The next prime is 3995640419. The reversal of 3995640409 is 9040465993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2711493184 + 1284147225 = 52072^2 + 35835^2 .

It is a cyclic number.

It is not a de Polignac number, because 3995640409 - 2¹⁹ = 3995116121 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3995640419) 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, 554314 + ... + 561475.

It is an arithmetic number, because the mean of its divisors is an integer number (999189945).

Almost surely, 2^3995640409 is an apocalyptic number.

It is an amenable number.

3995640409 is a deficient number, since it is larger than the sum of its proper divisors (1119371).

3995640409 is a wasteful number, since it uses less digits than its factorization.

3995640409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119370.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 3995640409 is about 63211.0782141865. The cubic root of 3995640409 is about 1586.8241407144.

The spelling of 3995640409 in words is "three billion, nine hundred ninety-five million, six hundred forty thousand, four hundred nine".