1320643 has 8 divisors (see below), whose sum is σ = 1361600. Its totient is φ = 1280448.

The previous prime is 1320623. The next prime is 1320667. The reversal of 1320643 is 3460231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320643.

It is not an unprimeable number, because it can be changed into a prime (1320623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5653 + ... + 5881.

It is an arithmetic number, because the mean of its divisors is an integer number (170200).

2^1320643 is an apocalyptic number.

1320643 is a deficient number, since it is larger than the sum of its proper divisors (40957).

1320643 is an equidigital number, since it uses as much as digits as its factorization.

1320643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1320643 is about 1149.1923250701. The cubic root of 1320643 is about 109.7139399280.

Adding to 1320643 its reverse (3460231), we get a palindrome (4780874).

The spelling of 1320643 in words is "one million, three hundred twenty thousand, six hundred forty-three".