12758721 has 32 divisors (see below), whose sum is σ = 19180800. Its totient is φ = 7501824.

The previous prime is 12758719. The next prime is 12758723. The reversal of 12758721 is 12785721.

It is an interprime number because it is at equal distance from previous prime (12758719) and next prime (12758723).

It is not a de Polignac number, because 12758721 - 2¹ = 12758719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12758723) 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 31 ways as a sum of consecutive naturals, for example, 85555 + ... + 85703.

It is an arithmetic number, because the mean of its divisors is an integer number (599400).

Almost surely, 2^12758721 is an apocalyptic number.

It is an amenable number.

12758721 is a deficient number, since it is larger than the sum of its proper divisors (6422079).

12758721 is a wasteful number, since it uses less digits than its factorization.

12758721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265.

The product of its digits is 7840, while the sum is 33.

The square root of 12758721 is about 3571.9351897816. The cubic root of 12758721 is about 233.6696888256.

Subtracting 12758721 from its reverse (12785721), we obtain a cube (27000 = 30³).

The spelling of 12758721 in words is "twelve million, seven hundred fifty-eight thousand, seven hundred twenty-one".