320686 has 4 divisors (see below), whose sum is σ = 481032. Its totient is φ = 160342.

The previous prime is 320669. The next prime is 320687. The reversal of 320686 is 686023.

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

It is a self number, because there is not a number n which added to its sum of digits gives 320686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80170 + ... + 80173.

It is an arithmetic number, because the mean of its divisors is an integer number (120258).

2³²⁰⁶⁸⁶ is an apocalyptic number.

320686 is a deficient number, since it is larger than the sum of its proper divisors (160346).

320686 is a wasteful number, since it uses less digits than its factorization.

320686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160345.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 320686 is about 566.2914443994. The cubic root of 320686 is about 68.4478797945.

The spelling of 320686 in words is "three hundred twenty thousand, six hundred eighty-six".