13528139 has 4 divisors (see below), whose sum is σ = 13535640. Its totient is φ = 13520640.

The previous prime is 13528129. The next prime is 13528159. The reversal of 13528139 is 93182531.

13528139 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93182531 = 13 ⋅7167887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13528139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13528129) 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, 779 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (3383910).

Almost surely, 2^13528139 is an apocalyptic number.

13528139 is a deficient number, since it is larger than the sum of its proper divisors (7501).

13528139 is an equidigital number, since it uses as much as digits as its factorization.

13528139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7500.

The product of its digits is 6480, while the sum is 32.

The square root of 13528139 is about 3678.0618537485. The cubic root of 13528139 is about 238.2754795704.

The spelling of 13528139 in words is "thirteen million, five hundred twenty-eight thousand, one hundred thirty-nine".