12381917 has 6 divisors (see below), whose sum is σ = 12598878. Its totient is φ = 12168632.

The previous prime is 12381911. The next prime is 12381931. The reversal of 12381917 is 71918321.

It can be written as a sum of positive squares in only one way, i.e., 8357881 + 4024036 = 2891^2 + 2006^2 .

It is not a de Polignac number, because 12381917 - 2¹⁸ = 12119773 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 (12381911) 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 5 ways as a sum of consecutive naturals, for example, 1703 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (2099813).

Almost surely, 2^12381917 is an apocalyptic number.

It is an amenable number.

12381917 is a deficient number, since it is larger than the sum of its proper divisors (216961).

12381917 is an frugal number, since it uses more digits than its factorization.

12381917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675 (or 3616 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 12381917 is about 3518.7948220946. The cubic root of 12381917 is about 231.3463380439.

The spelling of 12381917 in words is "twelve million, three hundred eighty-one thousand, nine hundred seventeen".