6857691 has 8 divisors (see below), whose sum is σ = 9390864. Its totient is φ = 4448160.

The previous prime is 6857687. The next prime is 6857699. The reversal of 6857691 is 1967586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6857691 - 2² = 6857687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6857699) 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 7 ways as a sum of consecutive naturals, for example, 30780 + ... + 31001.

It is an arithmetic number, because the mean of its divisors is an integer number (1173858).

Almost surely, 2^6857691 is an apocalyptic number.

6857691 is a deficient number, since it is larger than the sum of its proper divisors (2533173).

6857691 is a wasteful number, since it uses less digits than its factorization.

6857691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61821.

The product of its digits is 90720, while the sum is 42.

The square root of 6857691 is about 2618.7193434960. The cubic root of 6857691 is about 189.9879124351.

The spelling of 6857691 in words is "six million, eight hundred fifty-seven thousand, six hundred ninety-one".