1321328 has 20 divisors (see below), whose sum is σ = 2577960. Its totient is φ = 656064.

The previous prime is 1321319. The next prime is 1321349. The reversal of 1321328 is 8231231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4151 + ... + 4457.

It is an arithmetic number, because the mean of its divisors is an integer number (128898).

2^1321328 is an apocalyptic number.

It is an amenable number.

1321328 is a deficient number, since it is larger than the sum of its proper divisors (1256632).

1321328 is a wasteful number, since it uses less digits than its factorization.

1321328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 578 counting only the distinct ones).

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

The square root of 1321328 is about 1149.4903218383. The cubic root of 1321328 is about 109.7329057043.

Adding to 1321328 its reverse (8231231), we get a palindrome (9552559).

Subtracting 1321328 from its reverse (8231231), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1321328 in words is "one million, three hundred twenty-one thousand, three hundred twenty-eight".