1320305 has 24 divisors (see below), whose sum is σ = 1957608. Its totient is φ = 849408.

The previous prime is 1320301. The next prime is 1320307. The reversal of 1320305 is 5030231.

It can be written as a sum of positive squares in 4 ways, for example, as 50176 + 1270129 = 224^2 + 1127^2 .

It is not a de Polignac number, because 1320305 - 2² = 1320301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4007 + ... + 4323.

It is an arithmetic number, because the mean of its divisors is an integer number (81567).

2^1320305 is an apocalyptic number.

It is an amenable number.

1320305 is a deficient number, since it is larger than the sum of its proper divisors (637303).

1320305 is a wasteful number, since it uses less digits than its factorization.

1320305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 1320305 is about 1149.0452558537. The cubic root of 1320305 is about 109.7045792162.

Adding to 1320305 its reverse (5030231), we get a palindrome (6350536).

The spelling of 1320305 in words is "one million, three hundred twenty thousand, three hundred five".