12860721 has 16 divisors (see below), whose sum is σ = 20174400. Its totient is φ = 8069184.

The previous prime is 12860711. The next prime is 12860723. The reversal of 12860721 is 12706821.

It is not a de Polignac number, because 12860721 - 2¹⁰ = 12859697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12860723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13551 + ... + 14468.

It is an arithmetic number, because the mean of its divisors is an integer number (1260900).

Almost surely, 2^12860721 is an apocalyptic number.

It is an amenable number.

12860721 is a deficient number, since it is larger than the sum of its proper divisors (7313679).

12860721 is a wasteful number, since it uses less digits than its factorization.

12860721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28045 (or 28039 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 12860721 is about 3586.1847414767. The cubic root of 12860721 is about 234.2907300242.

The spelling of 12860721 in words is "twelve million, eight hundred sixty thousand, seven hundred twenty-one".