3943447872 has 336 divisors, whose sum is σ = 13766840640. Its totient is φ = 984711168.

The previous prime is 3943447847. The next prime is 3943447873. The reversal of 3943447872 is 2787443493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×3943447872² = 31101562238362656768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943447873) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2322928 + ... + 2324624.

It is an arithmetic number, because the mean of its divisors is an integer number (40972740).

Almost surely, 2^3943447872 is an apocalyptic number.

3943447872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3943447872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6883420320).

3943447872 is an abundant number, since it is smaller than the sum of its proper divisors (9823392768).

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

3943447872 is a wasteful number, since it uses less digits than its factorization.

3943447872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758 (or 1741 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 51.

The square root of 3943447872 is about 62796.8778841751. The cubic root of 3943447872 is about 1579.8846083543.

The spelling of 3943447872 in words is "three billion, nine hundred forty-three million, four hundred forty-seven thousand, eight hundred seventy-two".