13840729 has 8 divisors (see below), whose sum is σ = 15886080. Its totient is φ = 11812416.

The previous prime is 13840709. The next prime is 13840769. The reversal of 13840729 is 92704831.

13840729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13840729 - 2⁹ = 13840217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13840694 and 13840703.

It is not an unprimeable number, because it can be changed into a prime (13840709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2464 + ... + 5809.

It is an arithmetic number, because the mean of its divisors is an integer number (1985760).

Almost surely, 2^13840729 is an apocalyptic number.

It is an amenable number.

13840729 is a deficient number, since it is larger than the sum of its proper divisors (2045351).

13840729 is an equidigital number, since it uses as much as digits as its factorization.

13840729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8519.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 13840729 is about 3720.3130244645. The cubic root of 13840729 is about 240.0967723170.

The spelling of 13840729 in words is "thirteen million, eight hundred forty thousand, seven hundred twenty-nine".