7939999397 has 4 divisors (see below), whose sum is σ = 8661817536. Its totient is φ = 7218181260.

The previous prime is 7939999393. The next prime is 7939999409.

7939999397 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7939999397 - 2² = 7939999393 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 (7939999391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360909053 + ... + 360909074.

It is an arithmetic number, because the mean of its divisors is an integer number (2165454384).

Almost surely, 2^7939999397 is an apocalyptic number.

It is an amenable number.

7939999397 is a deficient number, since it is larger than the sum of its proper divisors (721818139).

7939999397 is a wasteful number, since it uses less digits than its factorization.

7939999397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721818138.

The product of its digits is 234365481, while the sum is 74.

The square root of 7939999397 is about 89106.6742561970. The cubic root of 7939999397 is about 1994.9873971520.

The spelling of 7939999397 in words is "seven billion, nine hundred thirty-nine million, nine hundred ninety-nine thousand, three hundred ninety-seven".