1305305 has 4 divisors (see below), whose sum is σ = 1566372. Its totient is φ = 1044240.

The previous prime is 1305301. The next prime is 1305307. The reversal of 1305305 is 5035031.

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 978121 + 327184 = 989^2 + 572^2 .

It is not a de Polignac number, because 1305305 - 2² = 1305301 is a prime.

It is a super-2 number, since 2×1305305² = 3407642286050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1305301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130526 + ... + 130535.

It is an arithmetic number, because the mean of its divisors is an integer number (391593).

2^1305305 is an apocalyptic number.

It is an amenable number.

1305305 is a deficient number, since it is larger than the sum of its proper divisors (261067).

1305305 is an equidigital number, since it uses as much as digits as its factorization.

1305305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261066.

The product of its (nonzero) digits is 225, while the sum is 17.

The square root of 1305305 is about 1142.4994529539. The cubic root of 1305305 is about 109.2875442391.

The spelling of 1305305 in words is "one million, three hundred five thousand, three hundred five".