13047985 has 4 divisors (see below), whose sum is σ = 15657588. Its totient is φ = 10438384.

The previous prime is 13047977. The next prime is 13047989. The reversal of 13047985 is 58974031.

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 5230369 + 7817616 = 2287^2 + 2796^2 .

It is a cyclic number.

It is not a de Polignac number, because 13047985 - 2³ = 13047977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13047989) 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, 1304794 + ... + 1304803.

It is an arithmetic number, because the mean of its divisors is an integer number (3914397).

Almost surely, 2^13047985 is an apocalyptic number.

It is an amenable number.

13047985 is a deficient number, since it is larger than the sum of its proper divisors (2609603).

13047985 is an equidigital number, since it uses as much as digits as its factorization.

13047985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609602.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 13047985 is about 3612.1994684679. The cubic root of 13047985 is about 235.4224181468.

The spelling of 13047985 in words is "thirteen million, forty-seven thousand, nine hundred eighty-five".