13722539 has 4 divisors (see below), whose sum is σ = 14195760. Its totient is φ = 13249320.

The previous prime is 13722529. The next prime is 13722571. The reversal of 13722539 is 93522731.

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 13722539 - 2¹⁶ = 13657003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13722529) 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, 236567 + ... + 236624.

It is an arithmetic number, because the mean of its divisors is an integer number (3548940).

Almost surely, 2^13722539 is an apocalyptic number.

13722539 is a deficient number, since it is larger than the sum of its proper divisors (473221).

13722539 is an equidigital number, since it uses as much as digits as its factorization.

13722539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473220.

The product of its digits is 11340, while the sum is 32.

The square root of 13722539 is about 3704.3945524201. The cubic root of 13722539 is about 239.4113990692.

The spelling of 13722539 in words is "thirteen million, seven hundred twenty-two thousand, five hundred thirty-nine".