321439 has 4 divisors (see below), whose sum is σ = 331840. Its totient is φ = 311040.

The previous prime is 321427. The next prime is 321443. The reversal of 321439 is 934123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934123 = 31 ⋅30133.

It is a cyclic number.

It is not a de Polignac number, because 321439 - 2⁷ = 321311 is a prime.

It is a Duffinian number.

321439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5154 + ... + 5215.

It is an arithmetic number, because the mean of its divisors is an integer number (82960).

2³²¹⁴³⁹ is an apocalyptic number.

321439 is a deficient number, since it is larger than the sum of its proper divisors (10401).

321439 is a wasteful number, since it uses less digits than its factorization.

321439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400.

The product of its digits is 648, while the sum is 22.

The square root of 321439 is about 566.9559065748. The cubic root of 321439 is about 68.5014118735.

The spelling of 321439 in words is "three hundred twenty-one thousand, four hundred thirty-nine".