3989646659 has 4 divisors (see below), whose sum is σ = 3990086904. Its totient is φ = 3989206416.

The previous prime is 3989646643. The next prime is 3989646719. The reversal of 3989646659 is 9566469893.

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

It is a cyclic number.

It is not a de Polignac number, because 3989646659 - 2⁴ = 3989646643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3989646595 and 3989646604.

It is not an unprimeable number, because it can be changed into a prime (3989646259) 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, 206237 + ... + 224750.

It is an arithmetic number, because the mean of its divisors is an integer number (997521726).

Almost surely, 2^3989646659 is an apocalyptic number.

3989646659 is a deficient number, since it is larger than the sum of its proper divisors (440245).

3989646659 is an equidigital number, since it uses as much as digits as its factorization.

3989646659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440244.

The product of its digits is 75582720, while the sum is 65.

The square root of 3989646659 is about 63163.6498232963. The cubic root of 3989646659 is about 1586.0302932598.

The spelling of 3989646659 in words is "three billion, nine hundred eighty-nine million, six hundred forty-six thousand, six hundred fifty-nine".