12381861 has 4 divisors (see below), whose sum is σ = 16509152. Its totient is φ = 8254572.

The previous prime is 12381851. The next prime is 12381883. The reversal of 12381861 is 16818321.

12381861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12381861 - 2⁵ = 12381829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381851) 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, 2063641 + ... + 2063646.

It is an arithmetic number, because the mean of its divisors is an integer number (4127288).

Almost surely, 2^12381861 is an apocalyptic number.

It is an amenable number.

12381861 is a deficient number, since it is larger than the sum of its proper divisors (4127291).

12381861 is an equidigital number, since it uses as much as digits as its factorization.

12381861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4127290.

The product of its digits is 2304, while the sum is 30.

The square root of 12381861 is about 3518.7868648158. The cubic root of 12381861 is about 231.3459892714.

The spelling of 12381861 in words is "twelve million, three hundred eighty-one thousand, eight hundred sixty-one".