3931443945 has 80 divisors (see below), whose sum is σ = 8279675712. Its totient is φ = 1759501440.

The previous prime is 3931443913. The next prime is 3931443949. The reversal of 3931443945 is 5493441393.

It is a happy number.

3931443945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3931443945 - 2⁵ = 3931443913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3931443945.

It is not an unprimeable number, because it can be changed into a prime (3931443949) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 23974 + ... + 91856.

Almost surely, 2^3931443945 is an apocalyptic number.

It is an amenable number.

3931443945 is an abundant number, since it is smaller than the sum of its proper divisors (4348231767).

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

3931443945 is a wasteful number, since it uses less digits than its factorization.

3931443945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67924 (or 67915 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 3931443945 is about 62701.2276195610. The cubic root of 3931443945 is about 1578.2799131894.

The spelling of 3931443945 in words is "three billion, nine hundred thirty-one million, four hundred forty-three thousand, nine hundred forty-five".