13072729 has 4 divisors (see below), whose sum is σ = 13426084. Its totient is φ = 12719376.

The previous prime is 13072699. The next prime is 13072739. The reversal of 13072729 is 92727031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92727031 = 449 ⋅206519.

It can be written as a sum of positive squares in 2 ways, for example, as 5890329 + 7182400 = 2427^2 + 2680^2 .

It is a cyclic number.

It is not a de Polignac number, because 13072729 - 2⁷ = 13072601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13072729.

It is not an unprimeable number, because it can be changed into a prime (13072739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176622 + ... + 176695.

It is an arithmetic number, because the mean of its divisors is an integer number (3356521).

Almost surely, 2^13072729 is an apocalyptic number.

It is an amenable number.

13072729 is a deficient number, since it is larger than the sum of its proper divisors (353355).

13072729 is an equidigital number, since it uses as much as digits as its factorization.

13072729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353354.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 13072729 is about 3615.6229062224. The cubic root of 13072729 is about 235.5711413368.

The spelling of 13072729 in words is "thirteen million, seventy-two thousand, seven hundred twenty-nine".