13638305 has 4 divisors (see below), whose sum is σ = 16365972. Its totient is φ = 10910640.

The previous prime is 13638299. The next prime is 13638307. The reversal of 13638305 is 50383631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50383631 = 17 ⋅2963743.

It can be written as a sum of positive squares in 2 ways, for example, as 5527201 + 8111104 = 2351^2 + 2848^2 .

It is not a de Polignac number, because 13638305 - 2¹² = 13634209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13638307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363826 + ... + 1363835.

It is an arithmetic number, because the mean of its divisors is an integer number (4091493).

Almost surely, 2^13638305 is an apocalyptic number.

It is an amenable number.

13638305 is a deficient number, since it is larger than the sum of its proper divisors (2727667).

13638305 is an equidigital number, since it uses as much as digits as its factorization.

13638305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727666.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 13638305 is about 3693.0075819039. The cubic root of 13638305 is about 238.9205281893.

The spelling of 13638305 in words is "thirteen million, six hundred thirty-eight thousand, three hundred five".