3989646817 has 8 divisors (see below), whose sum is σ = 4334566824. Its totient is φ = 3650158848.

The previous prime is 3989646803. The next prime is 3989646821. The reversal of 3989646817 is 7186469893.

It can be written as a sum of positive squares in 4 ways, for example, as 21150801 + 3968496016 = 4599^2 + 62996^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3989646817 - 2²⁷ = 3855429089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3989646317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356478 + ... + 1359415.

It is an arithmetic number, because the mean of its divisors is an integer number (541820853).

Almost surely, 2^3989646817 is an apocalyptic number.

It is an amenable number.

3989646817 is a deficient number, since it is larger than the sum of its proper divisors (344920007).

3989646817 is a wasteful number, since it uses less digits than its factorization.

3989646817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716019.

The product of its digits is 15676416, while the sum is 61.

The square root of 3989646817 is about 63163.6510740157. The cubic root of 3989646817 is about 1586.0303141967.

The spelling of 3989646817 in words is "three billion, nine hundred eighty-nine million, six hundred forty-six thousand, eight hundred seventeen".