13729813 has 4 divisors (see below), whose sum is σ = 13737600. Its totient is φ = 13722028.

The previous prime is 13729811. The next prime is 13729817. The reversal of 13729813 is 31892731.

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.

It is a cyclic number.

It is not a de Polignac number, because 13729813 - 2¹ = 13729811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13729811) 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, 156 + ... + 5242.

It is an arithmetic number, because the mean of its divisors is an integer number (3434400).

Almost surely, 2^13729813 is an apocalyptic number.

It is an amenable number.

13729813 is a deficient number, since it is larger than the sum of its proper divisors (7787).

13729813 is an equidigital number, since it uses as much as digits as its factorization.

13729813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7786.

The product of its digits is 9072, while the sum is 34.

The square root of 13729813 is about 3705.3762292107. The cubic root of 13729813 is about 239.4536937423.

The spelling of 13729813 in words is "thirteen million, seven hundred twenty-nine thousand, eight hundred thirteen".