6939857 has 4 divisors (see below), whose sum is σ = 6964836. Its totient is φ = 6914880.

The previous prime is 6939827. The next prime is 6939887. The reversal of 6939857 is 7589396.

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

It is an interprime number because it is at equal distance from previous prime (6939827) and next prime (6939887).

It can be written as a sum of positive squares in 2 ways, for example, as 5764801 + 1175056 = 2401^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 6939857 - 2⁸ = 6939601 is a prime.

It is a d-powerful number, because it can be written as 6³ + 9⁵ + 3 + 9⁷ + 8⁷ + 5³ + 7³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6939817) 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, 12068 + ... + 12629.

It is an arithmetic number, because the mean of its divisors is an integer number (1741209).

Almost surely, 2^6939857 is an apocalyptic number.

It is an amenable number.

6939857 is a deficient number, since it is larger than the sum of its proper divisors (24979).

6939857 is a wasteful number, since it uses less digits than its factorization.

6939857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24978.

The product of its digits is 408240, while the sum is 47.

The square root of 6939857 is about 2634.3608332952. The cubic root of 6939857 is about 190.7436873343.

The spelling of 6939857 in words is "six million, nine hundred thirty-nine thousand, eight hundred fifty-seven".