6857687 has 2 divisors, whose sum is σ = 6857688. Its totient is φ = 6857686.

The previous prime is 6857671. The next prime is 6857699. The reversal of 6857687 is 7867586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6857687 - 2⁴ = 6857671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6857387) 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 as a sum of consecutive naturals, namely, 3428843 + 3428844.

It is an arithmetic number, because the mean of its divisors is an integer number (3428844).

Almost surely, 2^6857687 is an apocalyptic number.

6857687 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857687 is an equidigital number, since it uses as much as digits as its factorization.

6857687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 47.

The square root of 6857687 is about 2618.7185797638. The cubic root of 6857687 is about 189.9878754959.

The spelling of 6857687 in words is "six million, eight hundred fifty-seven thousand, six hundred eighty-seven".