12381523 has 16 divisors (see below), whose sum is σ = 15584256. Its totient is φ = 9555840.

The previous prime is 12381517. The next prime is 12381557. The reversal of 12381523 is 32518321.

It is not a de Polignac number, because 12381523 - 2⁹ = 12381011 is a prime.

It is a super-2 number, since 2×12381523² = 306604223599058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12381583) 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, 7990 + ... + 9412.

It is an arithmetic number, because the mean of its divisors is an integer number (974016).

Almost surely, 2^12381523 is an apocalyptic number.

12381523 is a deficient number, since it is larger than the sum of its proper divisors (3202733).

12381523 is a wasteful number, since it uses less digits than its factorization.

12381523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554.

The product of its digits is 1440, while the sum is 25.

The square root of 12381523 is about 3518.7388365720. The cubic root of 12381523 is about 231.3438841583.

Adding to 12381523 its reverse (32518321), we get a palindrome (44899844).

The spelling of 12381523 in words is "twelve million, three hundred eighty-one thousand, five hundred twenty-three".