321390 has 24 divisors (see below), whose sum is σ = 835848. Its totient is φ = 85680.

The previous prime is 321383. The next prime is 321397. The reversal of 321390 is 93123.

It is an interprime number because it is at equal distance from previous prime (321383) and next prime (321397).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

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 321390.

It is not an unprimeable number, because it can be changed into a prime (321397) by changing a digit.

321390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1696 + ... + 1875.

It is an arithmetic number, because the mean of its divisors is an integer number (34827).

2³²¹³⁹⁰ is an apocalyptic number.

321390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

321390 is an abundant number, since it is smaller than the sum of its proper divisors (514458).

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

321390 is a wasteful number, since it uses less digits than its factorization.

321390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584 (or 3581 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 321390 is about 566.9126916907. The cubic root of 321390 is about 68.4979309230.

The spelling of 321390 in words is "three hundred twenty-one thousand, three hundred ninety".