12735729 has 6 divisors (see below), whose sum is σ = 18396066. Its totient is φ = 8490480.

The previous prime is 12735713. The next prime is 12735739. The reversal of 12735729 is 92753721.

12735729 is a `hidden beast` number, since 12 + 73 + 572 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 119025 = 3552^2 + 345^2 .

It is not a de Polignac number, because 12735729 - 2⁴ = 12735713 is a prime.

It is a super-2 number, since 2×12735729² = 324397586322882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12735693 and 12735702.

It is not an unprimeable number, because it can be changed into a prime (12735739) 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 5 ways as a sum of consecutive naturals, for example, 707532 + ... + 707549.

It is an arithmetic number, because the mean of its divisors is an integer number (3066011).

Almost surely, 2^12735729 is an apocalyptic number.

It is an amenable number.

12735729 is a deficient number, since it is larger than the sum of its proper divisors (5660337).

12735729 is a wasteful number, since it uses less digits than its factorization.

12735729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415087 (or 1415084 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 12735729 is about 3568.7153150679. The cubic root of 12735729 is about 233.5292420433.

The spelling of 12735729 in words is "twelve million, seven hundred thirty-five thousand, seven hundred twenty-nine".