3979794578791 has 4 divisors (see below), whose sum is σ = 4087356594472. Its totient is φ = 3872232563112.

The previous prime is 3979794578783. The next prime is 3979794578797. The reversal of 3979794578791 is 1978754979793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3979794578791 - 2³ = 3979794578783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3979794578699 and 3979794578708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3979794578797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53781007785 + ... + 53781007858.

It is an arithmetic number, because the mean of its divisors is an integer number (1021839148618).

Almost surely, 2^{3979794578791} is an apocalyptic number.

3979794578791 is a deficient number, since it is larger than the sum of its proper divisors (107562015681).

3979794578791 is a wasteful number, since it uses less digits than its factorization.

3979794578791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107562015680.

The product of its digits is 7561421280, while the sum is 85.

The spelling of 3979794578791 in words is "three trillion, nine hundred seventy-nine billion, seven hundred ninety-four million, five hundred seventy-eight thousand, seven hundred ninety-one".