6855985 has 8 divisors (see below), whose sum is σ = 8249256. Its totient is φ = 5470080.

The previous prime is 6855971. The next prime is 6856009. The reversal of 6855985 is 5895586.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 178929 + 6677056 = 423^2 + 2584^2 .

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

It is not a de Polignac number, because 6855985 - 2¹¹ = 6853937 is a prime.

It is a Duffinian number.

6855985 is a lucky number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 477 + ... + 3733.

It is an arithmetic number, because the mean of its divisors is an integer number (1031157).

Almost surely, 2^6855985 is an apocalyptic number.

It is an amenable number.

6855985 is a deficient number, since it is larger than the sum of its proper divisors (1393271).

6855985 is a wasteful number, since it uses less digits than its factorization.

6855985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683.

The product of its digits is 432000, while the sum is 46.

The square root of 6855985 is about 2618.3935914984. The cubic root of 6855985 is about 189.9721565847.

It can be divided in two parts, 68559 and 85, that added together give a square (68644 = 262²).

The spelling of 6855985 in words is "six million, eight hundred fifty-five thousand, nine hundred eighty-five".