3921791680 has 28 divisors (see below), whose sum is σ = 9338767200. Its totient is φ = 1568716544.

The previous prime is 3921791677. The next prime is 3921791683. The reversal of 3921791680 is 861971293.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3921791677) and next prime (3921791683).

It is a self number, because there is not a number n which added to its sum of digits gives 3921791680.

It is not an unprimeable number, because it can be changed into a prime (3921791683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6127480 + ... + 6128119.

It is an arithmetic number, because the mean of its divisors is an integer number (333527400).

Almost surely, 2^3921791680 is an apocalyptic number.

It is an amenable number.

3921791680 is an abundant number, since it is smaller than the sum of its proper divisors (5416975520).

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

3921791680 is a wasteful number, since it uses less digits than its factorization.

3921791680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12255616 (or 12255606 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 3921791680 is about 62624.2100149774. The cubic root of 3921791680 is about 1576.9872193412.

The spelling of 3921791680 in words is "three billion, nine hundred twenty-one million, seven hundred ninety-one thousand, six hundred eighty".