1320505 has 4 divisors (see below), whose sum is σ = 1584612. Its totient is φ = 1056400.

The previous prime is 1320437. The next prime is 1320533. The reversal of 1320505 is 5050231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 900601 = 648^2 + 949^2 .

It is not a de Polignac number, because 1320505 - 2⁷ = 1320377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132046 + ... + 132055.

It is an arithmetic number, because the mean of its divisors is an integer number (396153).

2^1320505 is an apocalyptic number.

It is an amenable number.

1320505 is a deficient number, since it is larger than the sum of its proper divisors (264107).

1320505 is an equidigital number, since it uses as much as digits as its factorization.

1320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264106.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 1320505 is about 1149.1322813323. The cubic root of 1320505 is about 109.7101182919.

Adding to 1320505 its reverse (5050231), we get a palindrome (6370736).

The spelling of 1320505 in words is "one million, three hundred twenty thousand, five hundred five".