6856861 has 4 divisors (see below), whose sum is σ = 7480224. Its totient is φ = 6233500.

The previous prime is 6856841. The next prime is 6856873. The reversal of 6856861 is 1686586.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6856861 - 2¹⁵ = 6824093 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 (6856841) 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, 311665 + ... + 311686.

It is an arithmetic number, because the mean of its divisors is an integer number (1870056).

Almost surely, 2^6856861 is an apocalyptic number.

It is an amenable number.

6856861 is a deficient number, since it is larger than the sum of its proper divisors (623363).

6856861 is a wasteful number, since it uses less digits than its factorization.

6856861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623362.

The product of its digits is 69120, while the sum is 40.

The square root of 6856861 is about 2618.5608642917. The cubic root of 6856861 is about 189.9802472540.

The spelling of 6856861 in words is "six million, eight hundred fifty-six thousand, eight hundred sixty-one".