321685 has 24 divisors (see below), whose sum is σ = 488376. Its totient is φ = 201600.

The previous prime is 321679. The next prime is 321707. The reversal of 321685 is 586123.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 53361 + 268324 = 231^2 + 518^2 .

It is not a de Polignac number, because 321685 - 2¹⁷ = 190613 is a prime.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3135 + ... + 3235.

It is an arithmetic number, because the mean of its divisors is an integer number (20349).

2³²¹⁶⁸⁵ is an apocalyptic number.

321685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

321685 is a deficient number, since it is larger than the sum of its proper divisors (166691).

321685 is a wasteful number, since it uses less digits than its factorization.

321685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 126 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 321685 is about 567.1728131707. The cubic root of 321685 is about 68.5188823218.

The spelling of 321685 in words is "three hundred twenty-one thousand, six hundred eighty-five".