6938668397 has 4 divisors (see below), whose sum is σ = 6938931840. Its totient is φ = 6938404956.

The previous prime is 6938668393. The next prime is 6938668409. The reversal of 6938668397 is 7938668396.

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 6938668397 - 2² = 6938668393 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 (6938668393) 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, 87197 + ... + 146562.

It is an arithmetic number, because the mean of its divisors is an integer number (1734732960).

Almost surely, 2^6938668397 is an apocalyptic number.

It is an amenable number.

6938668397 is a deficient number, since it is larger than the sum of its proper divisors (263443).

6938668397 is a wasteful number, since it uses less digits than its factorization.

6938668397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263442.

The product of its digits is 70543872, while the sum is 65.

The square root of 6938668397 is about 83298.6698393198. The cubic root of 6938668397 is about 1907.3279702998.

Subtracting 6938668397 from its reverse (7938668396), we obtain a palindrome (999999999).

The spelling of 6938668397 in words is "six billion, nine hundred thirty-eight million, six hundred sixty-eight thousand, three hundred ninety-seven".