1320909 has 4 divisors (see below), whose sum is σ = 1761216. Its totient is φ = 880604.

The previous prime is 1320901. The next prime is 1320911. The reversal of 1320909 is 9090231.

It is a happy number.

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 1320909 - 2³ = 1320901 is a prime.

It is a D-number.

1320909 is a modest number, since divided by 909 gives 132 as remainder.

1320909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320901) 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, 220149 + ... + 220154.

It is an arithmetic number, because the mean of its divisors is an integer number (440304).

2^1320909 is an apocalyptic number.

It is an amenable number.

1320909 is a deficient number, since it is larger than the sum of its proper divisors (440307).

1320909 is an equidigital number, since it uses as much as digits as its factorization.

1320909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440306.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 1320909 is about 1149.3080526995. The cubic root of 1320909 is about 109.7213055191.

The spelling of 1320909 in words is "one million, three hundred twenty thousand, nine hundred nine".