12728929 has 8 divisors (see below), whose sum is σ = 12941352. Its totient is φ = 12518400.

The previous prime is 12728927. The next prime is 12728939. The reversal of 12728929 is 92982721.

It can be written as a sum of positive squares in 4 ways, for example, as 2016400 + 10712529 = 1420^2 + 3273^2 .

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 12728929 - 2¹ = 12728927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12728891 and 12728900.

It is not an unprimeable number, because it can be changed into a prime (12728923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19167 + ... + 19819.

It is an arithmetic number, because the mean of its divisors is an integer number (1617669).

Almost surely, 2^12728929 is an apocalyptic number.

It is an amenable number.

12728929 is a deficient number, since it is larger than the sum of its proper divisors (212423).

12728929 is a wasteful number, since it uses less digits than its factorization.

12728929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947.

The product of its digits is 36288, while the sum is 40.

The square root of 12728929 is about 3567.7624640662. The cubic root of 12728929 is about 233.4876718131.

It can be divided in two parts, 1272 and 8929, that added together give a palindrome (10201).

The spelling of 12728929 in words is "twelve million, seven hundred twenty-eight thousand, nine hundred twenty-nine".