3968645891 has 8 divisors (see below), whose sum is σ = 4599477504. Its totient is φ = 3353784840.

The previous prime is 3968645887. The next prime is 3968645893. The reversal of 3968645891 is 1985468693.

3968645891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3968645891 - 2² = 3968645887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3968645891.

It is not an unprimeable number, because it can be changed into a prime (3968645893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3992105 + ... + 3993098.

It is an arithmetic number, because the mean of its divisors is an integer number (574934688).

Almost surely, 2^3968645891 is an apocalyptic number.

3968645891 is a deficient number, since it is larger than the sum of its proper divisors (630831613).

3968645891 is an equidigital number, since it uses as much as digits as its factorization.

3968645891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7985281.

The product of its digits is 11197440, while the sum is 59.

The square root of 3968645891 is about 62997.1895484235. The cubic root of 3968645891 is about 1583.2425386261.

The spelling of 3968645891 in words is "three billion, nine hundred sixty-eight million, six hundred forty-five thousand, eight hundred ninety-one".