13200905 has 4 divisors (see below), whose sum is σ = 15841092. Its totient is φ = 10560720.

The previous prime is 13200883. The next prime is 13200907. The reversal of 13200905 is 50900231.

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 8133904 + 5067001 = 2852^2 + 2251^2 .

It is not a de Polignac number, because 13200905 - 2⁶ = 13200841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13200907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320086 + ... + 1320095.

It is an arithmetic number, because the mean of its divisors is an integer number (3960273).

Almost surely, 2^13200905 is an apocalyptic number.

It is an amenable number.

13200905 is a deficient number, since it is larger than the sum of its proper divisors (2640187).

13200905 is an equidigital number, since it uses as much as digits as its factorization.

13200905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640186.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 13200905 is about 3633.3049693082. The cubic root of 13200905 is about 236.3385510181.

The spelling of 13200905 in words is "thirteen million, two hundred thousand, nine hundred five".