13129723 has 4 divisors (see below), whose sum is σ = 13153608. Its totient is φ = 13105840.

The previous prime is 13129693. The next prime is 13129747. The reversal of 13129723 is 32792131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32792131 = 71 ⋅461861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13129723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13129691 and 13129700.

It is not an unprimeable number, because it can be changed into a prime (13129793) 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, 11098 + ... + 12223.

It is an arithmetic number, because the mean of its divisors is an integer number (3288402).

Almost surely, 2^13129723 is an apocalyptic number.

13129723 is a deficient number, since it is larger than the sum of its proper divisors (23885).

13129723 is an equidigital number, since it uses as much as digits as its factorization.

13129723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23884.

The product of its digits is 2268, while the sum is 28.

The square root of 13129723 is about 3623.4959638449. The cubic root of 13129723 is about 235.9129898051.

The spelling of 13129723 in words is "thirteen million, one hundred twenty-nine thousand, seven hundred twenty-three".