13721523 has 16 divisors (see below), whose sum is σ = 18811296. Its totient is φ = 8893440.

The previous prime is 13721497. The next prime is 13721527. The reversal of 13721523 is 32512731.

It is not a de Polignac number, because 13721523 - 2⁶ = 13721459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13721493 and 13721502.

It is not an unprimeable number, because it can be changed into a prime (13721527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17365 + ... + 18137.

It is an arithmetic number, because the mean of its divisors is an integer number (1175706).

Almost surely, 2^13721523 is an apocalyptic number.

13721523 is a deficient number, since it is larger than the sum of its proper divisors (5089773).

13721523 is an equidigital number, since it uses as much as digits as its factorization.

13721523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934.

The product of its digits is 1260, while the sum is 24.

The square root of 13721523 is about 3704.2574154613. The cubic root of 13721523 is about 239.4054903477.

The spelling of 13721523 in words is "thirteen million, seven hundred twenty-one thousand, five hundred twenty-three".