3990599065 has 4 divisors (see below), whose sum is σ = 4788718884. Its totient is φ = 3192479248.

The previous prime is 3990599059. The next prime is 3990599069. The reversal of 3990599065 is 5609950993.

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 971755929 + 3018843136 = 31173^2 + 54944^2 .

It is a cyclic number.

It is not a de Polignac number, because 3990599065 - 2⁹ = 3990598553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3990598997 and 3990599015.

It is not an unprimeable number, because it can be changed into a prime (3990599069) 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, 399059902 + ... + 399059911.

It is an arithmetic number, because the mean of its divisors is an integer number (1197179721).

Almost surely, 2^3990599065 is an apocalyptic number.

It is an amenable number.

3990599065 is a deficient number, since it is larger than the sum of its proper divisors (798119819).

3990599065 is an equidigital number, since it uses as much as digits as its factorization.

3990599065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798119818.

The product of its (nonzero) digits is 2952450, while the sum is 55.

The square root of 3990599065 is about 63171.1885672575. The cubic root of 3990599065 is about 1586.1564886111.

The spelling of 3990599065 in words is "three billion, nine hundred ninety million, five hundred ninety-nine thousand, sixty-five".