12988729 has 4 divisors (see below), whose sum is σ = 13987876. Its totient is φ = 11989584.

The previous prime is 12988711. The next prime is 12988747. The reversal of 12988729 is 92788921.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12988711) and next prime (12988747).

It can be written as a sum of positive squares in 2 ways, for example, as 6996025 + 5992704 = 2645^2 + 2448^2 .

It is a cyclic number.

It is not a de Polignac number, because 12988729 - 2⁷ = 12988601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12988769) 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 3 ways as a sum of consecutive naturals, for example, 499554 + ... + 499579.

It is an arithmetic number, because the mean of its divisors is an integer number (3496969).

Almost surely, 2^12988729 is an apocalyptic number.

It is an amenable number.

12988729 is a deficient number, since it is larger than the sum of its proper divisors (999147).

12988729 is an equidigital number, since it uses as much as digits as its factorization.

12988729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999146.

The product of its digits is 145152, while the sum is 46.

The square root of 12988729 is about 3603.9879300575. The cubic root of 12988729 is about 235.0654955516.

The spelling of 12988729 in words is "twelve million, nine hundred eighty-eight thousand, seven hundred twenty-nine".