13005745 has 4 divisors (see below), whose sum is σ = 15606900. Its totient is φ = 10404592.

The previous prime is 13005739. The next prime is 13005757. The reversal of 13005745 is 54750031.

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 5645376 + 7360369 = 2376^2 + 2713^2 .

It is a cyclic number.

It is not a de Polignac number, because 13005745 - 2⁹ = 13005233 is a prime.

It is an unprimeable number.

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, 1300570 + ... + 1300579.

It is an arithmetic number, because the mean of its divisors is an integer number (3901725).

Almost surely, 2^13005745 is an apocalyptic number.

It is an amenable number.

13005745 is a deficient number, since it is larger than the sum of its proper divisors (2601155).

13005745 is an equidigital number, since it uses as much as digits as its factorization.

13005745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601154.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 13005745 is about 3606.3478756215. The cubic root of 13005745 is about 235.1681006397.

Adding to 13005745 its reverse (54750031), we get a palindrome (67755776).

The spelling of 13005745 in words is "thirteen million, five thousand, seven hundred forty-five".