13670729 has 4 divisors (see below), whose sum is σ = 13679376. Its totient is φ = 13662084.

The previous prime is 13670719. The next prime is 13670731. The reversal of 13670729 is 92707631.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92707631 = 19 ⋅4879349.

It is a cyclic number.

It is not a de Polignac number, because 13670729 - 2²⁰ = 12622153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13670719) 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, 1199 + ... + 5364.

It is an arithmetic number, because the mean of its divisors is an integer number (3419844).

Almost surely, 2^13670729 is an apocalyptic number.

It is an amenable number.

13670729 is a deficient number, since it is larger than the sum of its proper divisors (8647).

13670729 is an equidigital number, since it uses as much as digits as its factorization.

13670729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8646.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 13670729 is about 3697.3948937056. The cubic root of 13670729 is about 239.1097166111.

The spelling of 13670729 in words is "thirteen million, six hundred seventy thousand, seven hundred twenty-nine".