13209542 has 4 divisors (see below), whose sum is σ = 19814316. Its totient is φ = 6604770.

The previous prime is 13209523. The next prime is 13209563. The reversal of 13209542 is 24590231.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3302384 + ... + 3302387.

It is an arithmetic number, because the mean of its divisors is an integer number (4953579).

Almost surely, 2^13209542 is an apocalyptic number.

13209542 is a deficient number, since it is larger than the sum of its proper divisors (6604774).

13209542 is an equidigital number, since it uses as much as digits as its factorization.

13209542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6604773.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13209542 is about 3634.4933622171. The cubic root of 13209542 is about 236.3900831175.

Adding to 13209542 its reverse (24590231), we get a palindrome (37799773).

The spelling of 13209542 in words is "thirteen million, two hundred nine thousand, five hundred forty-two".