13247457 has 4 divisors (see below), whose sum is σ = 17663280. Its totient is φ = 8831636.

The previous prime is 13247453. The next prime is 13247473. The reversal of 13247457 is 75474231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13247457 - 2² = 13247453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13247453) 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, 2207907 + ... + 2207912.

It is an arithmetic number, because the mean of its divisors is an integer number (4415820).

Almost surely, 2^13247457 is an apocalyptic number.

It is an amenable number.

13247457 is a deficient number, since it is larger than the sum of its proper divisors (4415823).

13247457 is an equidigital number, since it uses as much as digits as its factorization.

13247457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415822.

The product of its digits is 23520, while the sum is 33.

The square root of 13247457 is about 3639.7056199643. The cubic root of 13247457 is about 236.6160351474.

The spelling of 13247457 in words is "thirteen million, two hundred forty-seven thousand, four hundred fifty-seven".