321686 has 8 divisors (see below), whose sum is σ = 494424. Its totient is φ = 156880.

The previous prime is 321679. The next prime is 321707. The reversal of 321686 is 686123.

321686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1880 + ... + 2043.

It is an arithmetic number, because the mean of its divisors is an integer number (61803).

2³²¹⁶⁸⁶ is an apocalyptic number.

321686 is a deficient number, since it is larger than the sum of its proper divisors (172738).

321686 is a wasteful number, since it uses less digits than its factorization.

321686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966.

The product of its digits is 1728, while the sum is 26.

The square root of 321686 is about 567.1736947356. The cubic root of 321686 is about 68.5189533217.

The spelling of 321686 in words is "three hundred twenty-one thousand, six hundred eighty-six".