320439 has 8 divisors (see below), whose sum is σ = 488320. Its totient is φ = 183096.

The previous prime is 320431. The next prime is 320449. The reversal of 320439 is 934023.

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

It is not a de Polignac number, because 320439 - 2³ = 320431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 15259 = 320439 / (3 + 2 + 0 + 4 + 3 + 9).

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 320439.

It is not an unprimeable number, because it can be changed into a prime (320431) 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, 7609 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (61040).

2³²⁰⁴³⁹ is an apocalyptic number.

320439 is a deficient number, since it is larger than the sum of its proper divisors (167881).

320439 is a wasteful number, since it uses less digits than its factorization.

320439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15269.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 320439 is about 566.0733168062. The cubic root of 320439 is about 68.4303018847.

The spelling of 320439 in words is "three hundred twenty thousand, four hundred thirty-nine".