13543443 has 20 divisors (see below), whose sum is σ = 20782960. Its totient is φ = 8782992.

The previous prime is 13543433. The next prime is 13543451. The reversal of 13543443 is 34434531.

It is not a de Polignac number, because 13543443 - 2⁴ = 13543427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13543423) 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 19 ways as a sum of consecutive naturals, for example, 738 + ... + 5256.

It is an arithmetic number, because the mean of its divisors is an integer number (1039148).

Almost surely, 2^13543443 is an apocalyptic number.

13543443 is a deficient number, since it is larger than the sum of its proper divisors (7239517).

13543443 is an equidigital number, since it uses as much as digits as its factorization.

13543443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568 (or 4559 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 13543443 is about 3680.1417092281. The cubic root of 13543443 is about 238.3652971404.

Adding to 13543443 its reverse (34434531), we get a palindrome (47977974).

The spelling of 13543443 in words is "thirteen million, five hundred forty-three thousand, four hundred forty-three".