3931344872 has 144 divisors (see below), whose sum is σ = 9750498660. Its totient is φ = 1472712192.

The previous prime is 3931344869. The next prime is 3931344881. The reversal of 3931344872 is 2784431393.

It can be written as a sum of positive squares in 2 ways, for example, as 3090692836 + 840652036 = 55594^2 + 28994^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1838588 + ... + 1840724.

Almost surely, 2^3931344872 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 3931344872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4875249330).

3931344872 is an abundant number, since it is smaller than the sum of its proper divisors (5819153788).

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

3931344872 is a wasteful number, since it uses less digits than its factorization.

3931344872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208 (or 2178 counting only the distinct ones).

The product of its digits is 435456, while the sum is 44.

The square root of 3931344872 is about 62700.4375742307. The cubic root of 3931344872 is about 1578.2666554447.

The spelling of 3931344872 in words is "three billion, nine hundred thirty-one million, three hundred forty-four thousand, eight hundred seventy-two".