13247643 has 4 divisors (see below), whose sum is σ = 17663528. Its totient is φ = 8831760.

The previous prime is 13247627. The next prime is 13247657. The reversal of 13247643 is 34674231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34674231 = 3 ⋅11558077.

It is not a de Polignac number, because 13247643 - 2⁴ = 13247627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13247643.

It is not an unprimeable number, because it can be changed into a prime (13247603) 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, 2207938 + ... + 2207943.

It is an arithmetic number, because the mean of its divisors is an integer number (4415882).

Almost surely, 2^13247643 is an apocalyptic number.

13247643 is a deficient number, since it is larger than the sum of its proper divisors (4415885).

13247643 is an equidigital number, since it uses as much as digits as its factorization.

13247643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415884.

The product of its digits is 12096, while the sum is 30.

The square root of 13247643 is about 3639.7311713916. The cubic root of 13247643 is about 236.6171425392.

The spelling of 13247643 in words is "thirteen million, two hundred forty-seven thousand, six hundred forty-three".