13638523 has 4 divisors (see below), whose sum is σ = 14356360. Its totient is φ = 12920688.

The previous prime is 13638511. The next prime is 13638551. The reversal of 13638523 is 32583631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13638523 - 2¹⁷ = 13507451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13638503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358890 + ... + 358927.

It is an arithmetic number, because the mean of its divisors is an integer number (3589090).

Almost surely, 2^13638523 is an apocalyptic number.

13638523 is a deficient number, since it is larger than the sum of its proper divisors (717837).

13638523 is an equidigital number, since it uses as much as digits as its factorization.

13638523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717836.

The product of its digits is 12960, while the sum is 31.

The square root of 13638523 is about 3693.0370970246. The cubic root of 13638523 is about 238.9218011822.

It can be divided in two parts, 13638 and 523, that added together give a square (14161 = 119²).

The spelling of 13638523 in words is "thirteen million, six hundred thirty-eight thousand, five hundred twenty-three".