6939791 has 4 divisors (see below), whose sum is σ = 7348032. Its totient is φ = 6531552.

The previous prime is 6939761. The next prime is 6939797. The reversal of 6939791 is 1979396.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6939791 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 (6939797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204095 + ... + 204128.

It is an arithmetic number, because the mean of its divisors is an integer number (1837008).

Almost surely, 2^6939791 is an apocalyptic number.

6939791 is a deficient number, since it is larger than the sum of its proper divisors (408241).

6939791 is a wasteful number, since it uses less digits than its factorization.

6939791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408240.

The product of its digits is 91854, while the sum is 44.

The square root of 6939791 is about 2634.3483065077. The cubic root of 6939791 is about 190.7430826569.

The spelling of 6939791 in words is "six million, nine hundred thirty-nine thousand, seven hundred ninety-one".