1685312 has 28 divisors (see below), whose sum is σ = 3543300. Its totient is φ = 792576.

The previous prime is 1685297. The next prime is 1685317. The reversal of 1685312 is 2135861.

It can be written as a sum of positive squares in 2 ways, for example, as 952576 + 732736 = 976^2 + 856^2 .

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8³ + 5⁵ + 3² + 1 + 2¹¹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685317) 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, 314 + ... + 1862.

2^1685312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1771650).

1685312 is an abundant number, since it is smaller than the sum of its proper divisors (1857988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685312 is a wasteful number, since it uses less digits than its factorization.

1685312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1568 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 1685312 is about 1298.1956709218. The cubic root of 1685312 is about 119.0036013316.

The spelling of 1685312 in words is "one million, six hundred eighty-five thousand, three hundred twelve".