320709 has 4 divisors (see below), whose sum is σ = 427616. Its totient is φ = 213804.

The previous prime is 320699. The next prime is 320713. The reversal of 320709 is 907023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 320709 - 2⁴ = 320693 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320709.

It is not an unprimeable number, because it can be changed into a prime (320759) 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, 53449 + ... + 53454.

It is an arithmetic number, because the mean of its divisors is an integer number (106904).

2³²⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

320709 is a deficient number, since it is larger than the sum of its proper divisors (106907).

320709 is a wasteful number, since it uses less digits than its factorization.

320709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106906.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 320709 is about 566.3117515998. The cubic root of 320709 is about 68.4495161445.

The spelling of 320709 in words is "three hundred twenty thousand, seven hundred nine".