1685725 has 6 divisors (see below), whose sum is σ = 2090330. Its totient is φ = 1348560.

The previous prime is 1685713. The next prime is 1685731. The reversal of 1685725 is 5275861.

It can be written as a sum of positive squares in 3 ways, for example, as 19044 + 1666681 = 138^2 + 1291^2 .

It is not a de Polignac number, because 1685725 - 2¹⁷ = 1554653 is a prime.

It is an Ulam number.

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 5 ways as a sum of consecutive naturals, for example, 33690 + ... + 33739.

2^1685725 is an apocalyptic number.

It is an amenable number.

1685725 is a deficient number, since it is larger than the sum of its proper divisors (404605).

1685725 is an equidigital number, since it uses as much as digits as its factorization.

1685725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67439 (or 67434 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The square root of 1685725 is about 1298.3547281078. The cubic root of 1685725 is about 119.0133214849.

The spelling of 1685725 in words is "one million, six hundred eighty-five thousand, seven hundred twenty-five".