1320809 has 4 divisors (see below), whose sum is σ = 1509504. Its totient is φ = 1132116.

The previous prime is 1320799. The next prime is 1320811. The reversal of 1320809 is 9080231.

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 a de Polignac number, because none of the positive numbers 2^k-1320809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94337 + ... + 94350.

It is an arithmetic number, because the mean of its divisors is an integer number (377376).

2^1320809 is an apocalyptic number.

It is an amenable number.

1320809 is a deficient number, since it is larger than the sum of its proper divisors (188695).

1320809 is an equidigital number, since it uses as much as digits as its factorization.

1320809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188694.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1320809 is about 1149.2645474389. The cubic root of 1320809 is about 109.7185366159.

The spelling of 1320809 in words is "one million, three hundred twenty thousand, eight hundred nine".