3944986647 has 16 divisors (see below), whose sum is σ = 6012494592. Its totient is φ = 2253870720.

The previous prime is 3944986631. The next prime is 3944986681. The reversal of 3944986647 is 7466894493.

It is a happy number.

3944986647 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3944986647 - 2⁴ = 3944986631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3944986247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132688 + ... + 159674.

It is an arithmetic number, because the mean of its divisors is an integer number (375780912).

Almost surely, 2^3944986647 is an apocalyptic number.

3944986647 is a deficient number, since it is larger than the sum of its proper divisors (2067507945).

3944986647 is a wasteful number, since it uses less digits than its factorization.

3944986647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33958.

The product of its digits is 31352832, while the sum is 60.

The square root of 3944986647 is about 62809.1286916162. The cubic root of 3944986647 is about 1580.0900775168.

The spelling of 3944986647 in words is "three billion, nine hundred forty-four million, nine hundred eighty-six thousand, six hundred forty-seven".