12381688 has 24 divisors (see below), whose sum is σ = 25520040. Its totient is φ = 5627600.

The previous prime is 12381641. The next prime is 12381689. The reversal of 12381688 is 88618321.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5428 + ... + 7363.

It is an arithmetic number, because the mean of its divisors is an integer number (1063335).

Almost surely, 2^12381688 is an apocalyptic number.

It is an amenable number.

12381688 is an abundant number, since it is smaller than the sum of its proper divisors (13138352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12381688 is a wasteful number, since it uses less digits than its factorization.

12381688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12819 (or 12804 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 12381688 is about 3518.7622823942. The cubic root of 12381688 is about 231.3449118071.

It can be divided in two parts, 123816 and 88, that added together give a square (123904 = 352²).

The spelling of 12381688 in words is "twelve million, three hundred eighty-one thousand, six hundred eighty-eight".