320909 has 8 divisors (see below), whose sum is σ = 348480. Its totient is φ = 294336.

The previous prime is 320899. The next prime is 320911. The reversal of 320909 is 909023.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320909 is a prime.

It is a Duffinian number.

320909 is a modest number, since divided by 909 gives 32 as remainder.

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 320909.

It is not an unprimeable number, because it can be changed into a prime (320939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512 + ... + 950.

It is an arithmetic number, because the mean of its divisors is an integer number (43560).

2³²⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

320909 is a deficient number, since it is larger than the sum of its proper divisors (27571).

320909 is a wasteful number, since it uses less digits than its factorization.

320909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 320909 is about 566.4883052632. The cubic root of 320909 is about 68.4637419780.

The spelling of 320909 in words is "three hundred twenty thousand, nine hundred nine".