1330809 has 4 divisors (see below), whose sum is σ = 1774416. Its totient is φ = 887204.

The previous prime is 1330789. The next prime is 1330831. The reversal of 1330809 is 9080331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1330809 - 2¹⁶ = 1265273 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1330859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221799 + ... + 221804.

It is an arithmetic number, because the mean of its divisors is an integer number (443604).

2^1330809 is an apocalyptic number.

It is an amenable number.

1330809 is a deficient number, since it is larger than the sum of its proper divisors (443607).

1330809 is an equidigital number, since it uses as much as digits as its factorization.

1330809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443606.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1330809 is about 1153.6069521288. The cubic root of 1330809 is about 109.9947380403.

The spelling of 1330809 in words is "one million, three hundred thirty thousand, eight hundred nine".