12381855 has 16 divisors (see below), whose sum is σ = 19995360. Its totient is φ = 6542208.

The previous prime is 12381851. The next prime is 12381883. The reversal of 12381855 is 55818321.

It is a happy number.

It is not a de Polignac number, because 12381855 - 2² = 12381851 is a prime.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2152 + ... + 5421.

It is an arithmetic number, because the mean of its divisors is an integer number (1249710).

Almost surely, 2^12381855 is an apocalyptic number.

12381855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12381855 is a deficient number, since it is larger than the sum of its proper divisors (7613505).

12381855 is a wasteful number, since it uses less digits than its factorization.

12381855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7690.

The product of its digits is 9600, while the sum is 33.

The square root of 12381855 is about 3518.7860122491. The cubic root of 12381855 is about 231.3459519029.

The spelling of 12381855 in words is "twelve million, three hundred eighty-one thousand, eight hundred fifty-five".