13805729 has 4 divisors (see below), whose sum is σ = 15777984. Its totient is φ = 11833476.

The previous prime is 13805677. The next prime is 13805731. The reversal of 13805729 is 92750831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13805729 - 2¹⁶ = 13740193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13805749) 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, 986117 + ... + 986130.

It is an arithmetic number, because the mean of its divisors is an integer number (3944496).

Almost surely, 2^13805729 is an apocalyptic number.

It is an amenable number.

13805729 is a deficient number, since it is larger than the sum of its proper divisors (1972255).

13805729 is an equidigital number, since it uses as much as digits as its factorization.

13805729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972254.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 13805729 is about 3715.6061416679. The cubic root of 13805729 is about 239.8942184292.

The spelling of 13805729 in words is "thirteen million, eight hundred five thousand, seven hundred twenty-nine".