3979945847 has 2 divisors, whose sum is σ = 3979945848. Its totient is φ = 3979945846.

The previous prime is 3979945817. The next prime is 3979945861. The reversal of 3979945847 is 7485499793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3979945847 - 2²⁴ = 3963168631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3979945817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989972923 + 1989972924.

It is an arithmetic number, because the mean of its divisors is an integer number (1989972924).

Almost surely, 2^3979945847 is an apocalyptic number.

3979945847 is a deficient number, since it is larger than the sum of its proper divisors (1).

3979945847 is an equidigital number, since it uses as much as digits as its factorization.

3979945847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 65.

The square root of 3979945847 is about 63086.8119895117. The cubic root of 3979945847 is about 1584.7437742563.

The spelling of 3979945847 in words is "three billion, nine hundred seventy-nine million, nine hundred forty-five thousand, eight hundred forty-seven".