12704729 has 6 divisors (see below), whose sum is σ = 13496334. Its totient is φ = 11957120.

The previous prime is 12704723. The next prime is 12704743. The reversal of 12704729 is 92740721.

It can be written as a sum of positive squares in 3 ways, for example, as 7414729 + 5290000 = 2723^2 + 2300^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12704729 is a prime.

It is a super-2 number, since 2×12704729² = 322820277926882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12704695 and 12704704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12704723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21692 + ... + 22269.

It is an arithmetic number, because the mean of its divisors is an integer number (2249389).

Almost surely, 2^12704729 is an apocalyptic number.

It is an amenable number.

12704729 is a deficient number, since it is larger than the sum of its proper divisors (791605).

12704729 is an equidigital number, since it uses as much as digits as its factorization.

12704729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43995 (or 43978 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 12704729 is about 3564.3693691872. The cubic root of 12704729 is about 233.3396104887.

The spelling of 12704729 in words is "twelve million, seven hundred four thousand, seven hundred twenty-nine".