13004905 has 8 divisors (see below), whose sum is σ = 16144200. Its totient is φ = 10045056.

The previous prime is 13004891. The next prime is 13004909. The reversal of 13004905 is 50940031.

It can be written as a sum of positive squares in 4 ways, for example, as 2108304 + 10896601 = 1452^2 + 3301^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13004905 - 2⁷ = 13004777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13004909) 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 7 ways as a sum of consecutive naturals, for example, 44700 + ... + 44989.

It is an arithmetic number, because the mean of its divisors is an integer number (2018025).

Almost surely, 2^13004905 is an apocalyptic number.

It is an amenable number.

13004905 is a deficient number, since it is larger than the sum of its proper divisors (3139295).

13004905 is an equidigital number, since it uses as much as digits as its factorization.

13004905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89723.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 13004905 is about 3606.2314124304. The cubic root of 13004905 is about 235.1630376090.

Adding to 13004905 its reverse (50940031), we get a palindrome (63944936).

The spelling of 13004905 in words is "thirteen million, four thousand, nine hundred five".