1320905 has 8 divisors (see below), whose sum is σ = 1609152. Its totient is φ = 1040688.

The previous prime is 1320901. The next prime is 1320911. The reversal of 1320905 is 5090231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320905 - 2² = 1320901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1320901) 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, 1637 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (201144).

2^1320905 is an apocalyptic number.

It is an amenable number.

1320905 is a deficient number, since it is larger than the sum of its proper divisors (288247).

1320905 is an equidigital number, since it uses as much as digits as its factorization.

1320905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1320905 is about 1149.3063125207. The cubic root of 1320905 is about 109.7211947657.

The spelling of 1320905 in words is "one million, three hundred twenty thousand, nine hundred five".