6861685 has 8 divisors (see below), whose sum is σ = 8287416. Its totient is φ = 5453760.

The previous prime is 6861629. The next prime is 6861691. The reversal of 6861685 is 5861686.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12996 + 6848689 = 114^2 + 2617^2 .

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

It is not a de Polignac number, because 6861685 - 2¹⁷ = 6730613 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

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, 3586 + ... + 5155.

It is an arithmetic number, because the mean of its divisors is an integer number (1035927).

Almost surely, 2^6861685 is an apocalyptic number.

It is an amenable number.

6861685 is a deficient number, since it is larger than the sum of its proper divisors (1425731).

6861685 is a wasteful number, since it uses less digits than its factorization.

6861685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8903.

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

The square root of 6861685 is about 2619.4818189863. The cubic root of 6861685 is about 190.0247890094.

Subtracting from 6861685 its reverse (5861686), we obtain a palindrome (999999).

The spelling of 6861685 in words is "six million, eight hundred sixty-one thousand, six hundred eighty-five".