13729121 has 8 divisors (see below), whose sum is σ = 15779520. Its totient is φ = 11701008.

The previous prime is 13729117. The next prime is 13729129. The reversal of 13729121 is 12192731.

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

It is a cyclic number.

It is not a de Polignac number, because 13729121 - 2² = 13729117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13729129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4226 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (1972440).

Almost surely, 2^13729121 is an apocalyptic number.

It is an amenable number.

13729121 is a deficient number, since it is larger than the sum of its proper divisors (2050399).

13729121 is a wasteful number, since it uses less digits than its factorization.

13729121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11143.

The product of its digits is 756, while the sum is 26.

The square root of 13729121 is about 3705.2828502019. The cubic root of 13729121 is about 239.4496707513.

The spelling of 13729121 in words is "thirteen million, seven hundred twenty-nine thousand, one hundred twenty-one".