3978422791 has 8 divisors (see below), whose sum is σ = 4547600384. Its totient is φ = 3409453080.

The previous prime is 3978422783. The next prime is 3978422827. The reversal of 3978422791 is 1972248793.

3978422791 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 a cyclic number.

It is not a de Polignac number, because 3978422791 - 2³ = 3978422783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978422761) 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, 8535 + ... + 89608.

It is an arithmetic number, because the mean of its divisors is an integer number (568450048).

Almost surely, 2^3978422791 is an apocalyptic number.

3978422791 is a deficient number, since it is larger than the sum of its proper divisors (569177593).

3978422791 is an equidigital number, since it uses as much as digits as its factorization.

3978422791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103941.

The product of its digits is 1524096, while the sum is 52.

The square root of 3978422791 is about 63074.7397220155. The cubic root of 3978422791 is about 1584.5415971782.

The spelling of 3978422791 in words is "three billion, nine hundred seventy-eight million, four hundred twenty-two thousand, seven hundred ninety-one".