13243643 has 4 divisors (see below), whose sum is σ = 15135600. Its totient is φ = 11351688.

The previous prime is 13243631. The next prime is 13243661. The reversal of 13243643 is 34634231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13243643 - 2⁶ = 13243579 is a prime.

It is a super-2 number, since 2×13243643² = 350788159822898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13245643) by changing a digit.

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, 945968 + ... + 945981.

It is an arithmetic number, because the mean of its divisors is an integer number (3783900).

Almost surely, 2^13243643 is an apocalyptic number.

13243643 is a deficient number, since it is larger than the sum of its proper divisors (1891957).

13243643 is an equidigital number, since it uses as much as digits as its factorization.

13243643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891956.

The product of its digits is 5184, while the sum is 26.

The square root of 13243643 is about 3639.1816387754. The cubic root of 13243643 is about 236.5933253755.

Adding to 13243643 its reverse (34634231), we get a palindrome (47877874).

The spelling of 13243643 in words is "thirteen million, two hundred forty-three thousand, six hundred forty-three".