13508305 has 4 divisors (see below), whose sum is σ = 16209972. Its totient is φ = 10806640.

The previous prime is 13508303. The next prime is 13508323. The reversal of 13508305 is 50380531.

It is a happy number.

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 8346321 + 5161984 = 2889^2 + 2272^2 .

It is not a de Polignac number, because 13508305 - 2¹ = 13508303 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 13508305.

It is not an unprimeable number, because it can be changed into a prime (13508303) 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, 1350826 + ... + 1350835.

It is an arithmetic number, because the mean of its divisors is an integer number (4052493).

Almost surely, 2^13508305 is an apocalyptic number.

It is an amenable number.

13508305 is a deficient number, since it is larger than the sum of its proper divisors (2701667).

13508305 is an equidigital number, since it uses as much as digits as its factorization.

13508305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701666.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 13508305 is about 3675.3646077634. The cubic root of 13508305 is about 238.1589750665.

Adding to 13508305 its reverse (50380531), we get a palindrome (63888836).

The spelling of 13508305 in words is "thirteen million, five hundred eight thousand, three hundred five".