13405543 has 4 divisors (see below), whose sum is σ = 13625368. Its totient is φ = 13185720.

The previous prime is 13405541. The next prime is 13405549. The reversal of 13405543 is 34550431.

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 13405543 - 2¹ = 13405541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13405541) 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, 109821 + ... + 109942.

It is an arithmetic number, because the mean of its divisors is an integer number (3406342).

Almost surely, 2^13405543 is an apocalyptic number.

13405543 is a deficient number, since it is larger than the sum of its proper divisors (219825).

13405543 is an equidigital number, since it uses as much as digits as its factorization.

13405543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219824.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 13405543 is about 3661.3580813682. The cubic root of 13405543 is about 237.5535199791.

Adding to 13405543 its reverse (34550431), we get a palindrome (47955974).

The spelling of 13405543 in words is "thirteen million, four hundred five thousand, five hundred forty-three".