7939394871 has 4 divisors (see below), whose sum is σ = 10585859832. Its totient is φ = 5292929912.

The previous prime is 7939394867. The next prime is 7939394899. The reversal of 7939394871 is 1784939397.

It is a happy number.

7939394871 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7939394871 - 2² = 7939394867 is a prime.

It is a super-2 number, since 2×7939394871² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7939394831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1323232476 + ... + 1323232481.

It is an arithmetic number, because the mean of its divisors is an integer number (2646464958).

Almost surely, 2^7939394871 is an apocalyptic number.

7939394871 is a deficient number, since it is larger than the sum of its proper divisors (2646464961).

7939394871 is a wasteful number, since it uses less digits than its factorization.

7939394871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646464960.

The product of its digits is 10287648, while the sum is 60.

The square root of 7939394871 is about 89103.2820439292. The cubic root of 7939394871 is about 1994.9367652271.

The spelling of 7939394871 in words is "seven billion, nine hundred thirty-nine million, three hundred ninety-four thousand, eight hundred seventy-one".