321376 has 36 divisors (see below), whose sum is σ = 703836. Its totient is φ = 144320.

The previous prime is 321371. The next prime is 321383. The reversal of 321376 is 673123.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321371) 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, 3831 + ... + 3913.

It is an arithmetic number, because the mean of its divisors is an integer number (19551).

2³²¹³⁷⁶ 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 321376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351918).

321376 is an abundant number, since it is smaller than the sum of its proper divisors (382460).

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

321376 is a wasteful number, since it uses less digits than its factorization.

321376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 96 counting only the distinct ones).

The product of its digits is 756, while the sum is 22.

The square root of 321376 is about 566.9003439759. The cubic root of 321376 is about 68.4969363007.

Adding to 321376 its reverse (673123), we get a palindrome (994499).

The spelling of 321376 in words is "three hundred twenty-one thousand, three hundred seventy-six".