6856887 has 4 divisors (see below), whose sum is σ = 9142520. Its totient is φ = 4571256.

The previous prime is 6856873. The next prime is 6856897. The reversal of 6856887 is 7886586.

It is a happy number.

6856887 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6856887 - 2⁸ = 6856631 is a prime.

It is a D-number.

It is a Duffinian number.

6856887 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142812 + ... + 1142817.

It is an arithmetic number, because the mean of its divisors is an integer number (2285630).

Almost surely, 2^6856887 is an apocalyptic number.

6856887 is a deficient number, since it is larger than the sum of its proper divisors (2285633).

6856887 is a wasteful number, since it uses less digits than its factorization.

6856887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285632.

The product of its digits is 645120, while the sum is 48.

The square root of 6856887 is about 2618.5658288460. The cubic root of 6856887 is about 189.9804873775.

The spelling of 6856887 in words is "six million, eight hundred fifty-six thousand, eight hundred eighty-seven".