13613729 has 4 divisors (see below), whose sum is σ = 13646640. Its totient is φ = 13580820.

The previous prime is 13613713. The next prime is 13613741. The reversal of 13613729 is 92731631.

It is a happy number.

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 13613729 - 2⁴ = 13613713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13613695 and 13613704.

It is not an unprimeable number, because it can be changed into a prime (13613779) 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, 15827 + ... + 16664.

It is an arithmetic number, because the mean of its divisors is an integer number (3411660).

Almost surely, 2^13613729 is an apocalyptic number.

It is an amenable number.

13613729 is a deficient number, since it is larger than the sum of its proper divisors (32911).

13613729 is an equidigital number, since it uses as much as digits as its factorization.

13613729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32910.

The product of its digits is 6804, while the sum is 32.

The square root of 13613729 is about 3689.6787123000. The cubic root of 13613729 is about 238.7769316220.

The spelling of 13613729 in words is "thirteen million, six hundred thirteen thousand, seven hundred twenty-nine".