3943911664 has 80 divisors (see below), whose sum is σ = 9641882880. Its totient is φ = 1518036480.

The previous prime is 3943911623. The next prime is 3943911689. The reversal of 3943911664 is 4661193493.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82972 + ... + 121540.

It is an arithmetic number, because the mean of its divisors is an integer number (120523536).

Almost surely, 2^3943911664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3943911664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4820941440).

3943911664 is an abundant number, since it is smaller than the sum of its proper divisors (5697971216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3943911664 is a wasteful number, since it uses less digits than its factorization.

3943911664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38678 (or 38672 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The square root of 3943911664 is about 62800.5705706564. The cubic root of 3943911664 is about 1579.9465430827.

The spelling of 3943911664 in words is "three billion, nine hundred forty-three million, nine hundred eleven thousand, six hundred sixty-four".