3944694643 has 8 divisors (see below), whose sum is σ = 3962013440. Its totient is φ = 3927414600.

The previous prime is 3944694617. The next prime is 3944694647. The reversal of 3944694643 is 3464964493.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3944694643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3944694647) 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, 204568 + ... + 223018.

It is an arithmetic number, because the mean of its divisors is an integer number (495251680).

Almost surely, 2^3944694643 is an apocalyptic number.

3944694643 is a deficient number, since it is larger than the sum of its proper divisors (17318797).

3944694643 is a wasteful number, since it uses less digits than its factorization.

3944694643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19377.

The product of its digits is 6718464, while the sum is 52.

The square root of 3944694643 is about 62806.8041138856. The cubic root of 3944694643 is about 1580.0510909880.

The spelling of 3944694643 in words is "three billion, nine hundred forty-four million, six hundred ninety-four thousand, six hundred forty-three".