319909 has 4 divisors (see below), whose sum is σ = 321516. Its totient is φ = 318304.

The previous prime is 319901. The next prime is 319919. The reversal of 319909 is 909913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909913 = 41 ⋅22193.

It can be written as a sum of positive squares in 2 ways, for example, as 216225 + 103684 = 465^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 319909 - 2³ = 319901 is a prime.

It is a Duffinian 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 319909.

It is not an unprimeable number, because it can be changed into a prime (319901) 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, 454 + ... + 919.

It is an arithmetic number, because the mean of its divisors is an integer number (80379).

2³¹⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

319909 is a deficient number, since it is larger than the sum of its proper divisors (1607).

319909 is a wasteful number, since it uses less digits than its factorization.

319909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 319909 is about 565.6049858338. The cubic root of 319909 is about 68.3925535936.

The spelling of 319909 in words is "three hundred nineteen thousand, nine hundred nine".