321399 has 24 divisors (see below), whose sum is σ = 519792. Its totient is φ = 190080.

The previous prime is 321397. The next prime is 321403. The reversal of 321399 is 993123.

It is not a de Polignac number, because 321399 - 2¹ = 321397 is a prime.

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 321399.

It is not an unprimeable number, because it can be changed into a prime (321397) 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 23 ways as a sum of consecutive naturals, for example, 4764 + ... + 4830.

It is an arithmetic number, because the mean of its divisors is an integer number (21658).

2³²¹³⁹⁹ is an apocalyptic number.

321399 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

321399 is a deficient number, since it is larger than the sum of its proper divisors (198393).

321399 is a wasteful number, since it uses less digits than its factorization.

321399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 124 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 321399 is about 566.9206293653. The cubic root of 321399 is about 68.4985703078.

It can be divided in two parts, 32 and 1399, that added together give a triangular number (1431 = T₅₃).

The spelling of 321399 in words is "three hundred twenty-one thousand, three hundred ninety-nine".