1320321 has 8 divisors (see below), whose sum is σ = 1817344. Its totient is φ = 851760.

The previous prime is 1320307. The next prime is 1320331. The reversal of 1320321 is 1230231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1320321 - 2¹⁵ = 1287553 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1320297 and 1320306.

It is not an unprimeable number, because it can be changed into a prime (1320301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7006 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (227168).

2^1320321 is an apocalyptic number.

It is an amenable number.

1320321 is a deficient number, since it is larger than the sum of its proper divisors (497023).

1320321 is a wasteful number, since it uses less digits than its factorization.

1320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14231.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1320321 is about 1149.0522181346. The cubic root of 1320321 is about 109.7050223628.

Adding to 1320321 its reverse (1230231), we get a palindrome (2550552).

The spelling of 1320321 in words is "one million, three hundred twenty thousand, three hundred twenty-one".