12529721 has 8 divisors (see below), whose sum is σ = 13228320. Its totient is φ = 11835072.

The previous prime is 12529691. The next prime is 12529729. The reversal of 12529721 is 12792521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12529721 - 2²² = 8335417 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12529729) 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, 7466 + ... + 8988.

It is an arithmetic number, because the mean of its divisors is an integer number (1653540).

Almost surely, 2^12529721 is an apocalyptic number.

It is an amenable number.

12529721 is a deficient number, since it is larger than the sum of its proper divisors (698599).

12529721 is a wasteful number, since it uses less digits than its factorization.

12529721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975.

The product of its digits is 2520, while the sum is 29.

The square root of 12529721 is about 3539.7345945706. The cubic root of 12529721 is about 232.2632329742.

The spelling of 12529721 in words is "twelve million, five hundred twenty-nine thousand, seven hundred twenty-one".