12987729 has 32 divisors (see below), whose sum is σ = 20275200. Its totient is φ = 8205840.

The previous prime is 12987713. The next prime is 12987761. The reversal of 12987729 is 92778921.

12987729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12987729 - 2⁴ = 12987713 is a prime.

It is a super-2 number, since 2×12987729² = 337362209154882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12987769) 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, 49252 + ... + 49514.

It is an arithmetic number, because the mean of its divisors is an integer number (633600).

Almost surely, 2^12987729 is an apocalyptic number.

It is an amenable number.

12987729 is a deficient number, since it is larger than the sum of its proper divisors (7287471).

12987729 is a wasteful number, since it uses less digits than its factorization.

12987729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 356 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 12987729 is about 3603.8491921833. The cubic root of 12987729 is about 235.0594628461.

The spelling of 12987729 in words is "twelve million, nine hundred eighty-seven thousand, seven hundred twenty-nine".