12528729 has 16 divisors (see below), whose sum is σ = 18867840. Its totient is φ = 8214480.

The previous prime is 12528713. The next prime is 12528749. The reversal of 12528729 is 92782521.

12528729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12528729 - 2⁴ = 12528713 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12528693 and 12528702.

It is not an unprimeable number, because it can be changed into a prime (12528749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157 + ... + 5450.

It is an arithmetic number, because the mean of its divisors is an integer number (1179240).

Almost surely, 2^12528729 is an apocalyptic number.

It is an amenable number.

12528729 is a deficient number, since it is larger than the sum of its proper divisors (6339111).

12528729 is an equidigital number, since it uses as much as digits as its factorization.

12528729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7677 (or 7671 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12528729 is about 3539.5944682972. The cubic root of 12528729 is about 232.2571032498.

It can be divided in two parts, 125287 and 29, that added together give a square (125316 = 354²).

The spelling of 12528729 in words is "twelve million, five hundred twenty-eight thousand, seven hundred twenty-nine".