13520723 has 4 divisors (see below), whose sum is σ = 14232360. Its totient is φ = 12809088.

The previous prime is 13520719. The next prime is 13520779. The reversal of 13520723 is 32702531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32702531 = 419 ⋅78049.

It is a cyclic number.

It is not a de Polignac number, because 13520723 - 2² = 13520719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13525723) 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, 355790 + ... + 355827.

It is an arithmetic number, because the mean of its divisors is an integer number (3558090).

Almost surely, 2^13520723 is an apocalyptic number.

13520723 is a deficient number, since it is larger than the sum of its proper divisors (711637).

13520723 is an equidigital number, since it uses as much as digits as its factorization.

13520723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711636.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 13520723 is about 3677.0535758947. The cubic root of 13520723 is about 238.2319314778.

The spelling of 13520723 in words is "thirteen million, five hundred twenty thousand, seven hundred twenty-three".