12809529 has 32 divisors (see below), whose sum is σ = 19725440. Its totient is φ = 8211456.

The previous prime is 12809513. The next prime is 12809539. The reversal of 12809529 is 92590821.

12809529 is a `hidden beast` number, since 128 + 0 + 9 + 529 = 666.

It is not a de Polignac number, because 12809529 - 2⁴ = 12809513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12809493 and 12809502.

It is not an unprimeable number, because it can be changed into a prime (12809539) 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 31 ways as a sum of consecutive naturals, for example, 132009 + ... + 132105.

It is an arithmetic number, because the mean of its divisors is an integer number (616420).

Almost surely, 2^12809529 is an apocalyptic number.

It is an amenable number.

12809529 is a deficient number, since it is larger than the sum of its proper divisors (6915911).

12809529 is an equidigital number, since it uses as much as digits as its factorization.

12809529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 12809529 is about 3579.0402344763. The cubic root of 12809529 is about 233.9794525022.

The spelling of 12809529 in words is "twelve million, eight hundred nine thousand, five hundred twenty-nine".