13720529 has 4 divisors (see below), whose sum is σ = 13797360. Its totient is φ = 13643700.

The previous prime is 13720523. The next prime is 13720543. The reversal of 13720529 is 92502731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92502731 = 823 ⋅112397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13720529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13720523) 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, 38147 + ... + 38504.

It is an arithmetic number, because the mean of its divisors is an integer number (3449340).

Almost surely, 2^13720529 is an apocalyptic number.

It is an amenable number.

13720529 is a deficient number, since it is larger than the sum of its proper divisors (76831).

13720529 is an equidigital number, since it uses as much as digits as its factorization.

13720529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76830.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 13720529 is about 3704.1232430901. The cubic root of 13720529 is about 239.3997092886.

The spelling of 13720529 in words is "thirteen million, seven hundred twenty thousand, five hundred twenty-nine".