12839721 has 8 divisors (see below), whose sum is σ = 17710080. Its totient is φ = 8264592.

The previous prime is 12839719. The next prime is 12839747. The reversal of 12839721 is 12793821.

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

It is not a de Polignac number, because 12839721 - 2¹ = 12839719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12835721) 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, 73705 + ... + 73878.

It is an arithmetic number, because the mean of its divisors is an integer number (2213760).

Almost surely, 2^12839721 is an apocalyptic number.

It is an amenable number.

12839721 is a deficient number, since it is larger than the sum of its proper divisors (4870359).

12839721 is a wasteful number, since it uses less digits than its factorization.

12839721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147615.

The product of its digits is 6048, while the sum is 33.

The square root of 12839721 is about 3583.2556425686. The cubic root of 12839721 is about 234.1631377547.

The spelling of 12839721 in words is "twelve million, eight hundred thirty-nine thousand, seven hundred twenty-one".