1686085 has 4 divisors (see below), whose sum is σ = 2023308. Its totient is φ = 1348864.

The previous prime is 1686071. The next prime is 1686109. The reversal of 1686085 is 5806861.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1044484 + 641601 = 1022^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686085 - 2⁹ = 1685573 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1686085.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 168604 + ... + 168613.

It is an arithmetic number, because the mean of its divisors is an integer number (505827).

2^1686085 is an apocalyptic number.

It is an amenable number.

1686085 is a deficient number, since it is larger than the sum of its proper divisors (337223).

1686085 is an equidigital number, since it uses as much as digits as its factorization.

1686085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337222.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1686085 is about 1298.4933577035. The cubic root of 1686085 is about 119.0217929628.

The spelling of 1686085 in words is "one million, six hundred eighty-six thousand, eighty-five".