13209528 has 32 divisors (see below), whose sum is σ = 33120000. Its totient is φ = 4390368.

The previous prime is 13209523. The next prime is 13209563. The reversal of 13209528 is 82590231.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13209495 and 13209504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13209523) 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 7 ways as a sum of consecutive naturals, for example, 11425 + ... + 12527.

It is an arithmetic number, because the mean of its divisors is an integer number (1035000).

Almost surely, 2^13209528 is an apocalyptic number.

It is an amenable number.

13209528 is an abundant number, since it is smaller than the sum of its proper divisors (19910472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13209528 is a wasteful number, since it uses less digits than its factorization.

13209528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611 (or 1607 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13209528 is about 3634.4914362260. The cubic root of 13209528 is about 236.3899996056.

Adding to 13209528 its reverse (82590231), we get a palindrome (95799759).

The spelling of 13209528 in words is "thirteen million, two hundred nine thousand, five hundred twenty-eight".