3959145865 has 16 divisors (see below), whose sum is σ = 4809542400. Its totient is φ = 3128349312.

The previous prime is 3959145833. The next prime is 3959145913. The reversal of 3959145865 is 5685419593.

It is a cyclic number.

It is not a de Polignac number, because 3959145865 - 2⁵ = 3959145833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458074 + ... + 466636.

It is an arithmetic number, because the mean of its divisors is an integer number (300596400).

Almost surely, 2^3959145865 is an apocalyptic number.

It is an amenable number.

3959145865 is a deficient number, since it is larger than the sum of its proper divisors (850396535).

3959145865 is a wasteful number, since it uses less digits than its factorization.

3959145865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9696.

The product of its digits is 5832000, while the sum is 55.

The square root of 3959145865 is about 62921.7439761487. The cubic root of 3959145865 is about 1581.9782230281.

The spelling of 3959145865 in words is "three billion, nine hundred fifty-nine million, one hundred forty-five thousand, eight hundred sixty-five".