321318 has 12 divisors (see below), whose sum is σ = 696228. Its totient is φ = 107100.

The previous prime is 321313. The next prime is 321319. The reversal of 321318 is 813123.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 17851 = 321318 / (3 + 2 + 1 + 3 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 321318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8908 + ... + 8943.

It is an arithmetic number, because the mean of its divisors is an integer number (58019).

2³²¹³¹⁸ is an apocalyptic number.

321318 is an abundant number, since it is smaller than the sum of its proper divisors (374910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321318 is a wasteful number, since it uses less digits than its factorization.

321318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17859 (or 17856 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 321318 is about 566.8491862921. The cubic root of 321318 is about 68.4928154150.

It can be divided in two parts, 3 and 21318, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 321318 in words is "three hundred twenty-one thousand, three hundred eighteen".