321860 has 72 divisors (see below), whose sum is σ = 893760. Its totient is φ = 95040.

The previous prime is 321851. The next prime is 321889. The reversal of 321860 is 68123.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 14.

It is an unprimeable number.

321860 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 23 ways as a sum of consecutive naturals, for example, 16931 + ... + 16949.

2³²¹⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446880).

321860 is an abundant number, since it is smaller than the sum of its proper divisors (571900).

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

321860 is a wasteful number, since it uses less digits than its factorization.

321860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 321860 is about 567.3270661620. The cubic root of 321860 is about 68.5313050653.

Adding to 321860 its reverse (68123), we get a palindrome (389983).

The spelling of 321860 in words is "three hundred twenty-one thousand, eight hundred sixty".