321879 has 8 divisors (see below), whose sum is σ = 451840. Its totient is φ = 203256.

The previous prime is 321851. The next prime is 321889. The reversal of 321879 is 978123.

It is a happy number.

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

It is not a de Polignac number, because 321879 - 2⁵ = 321847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2767 + ... + 2880.

It is an arithmetic number, because the mean of its divisors is an integer number (56480).

2³²¹⁸⁷⁹ is an apocalyptic number.

321879 is a deficient number, since it is larger than the sum of its proper divisors (129961).

321879 is a wasteful number, since it uses less digits than its factorization.

321879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5669.

The product of its digits is 3024, while the sum is 30.

The square root of 321879 is about 567.3438111058. The cubic root of 321879 is about 68.5326535493.

The spelling of 321879 in words is "three hundred twenty-one thousand, eight hundred seventy-nine".