12318381 has 12 divisors (see below), whose sum is σ = 17837820. Its totient is φ = 8191680.

The previous prime is 12318379. The next prime is 12318413. The reversal of 12318381 is 18381321.

It can be written as a sum of positive squares in 2 ways, for example, as 1368900 + 10949481 = 1170^2 + 3309^2 .

It is not a de Polignac number, because 12318381 - 2¹ = 12318379 is a prime.

It is a super-2 number, since 2×12318381² = 303485020922322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12313381) 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 11 ways as a sum of consecutive naturals, for example, 2665 + ... + 5633.

It is an arithmetic number, because the mean of its divisors is an integer number (1486485).

Almost surely, 2^12318381 is an apocalyptic number.

It is an amenable number.

12318381 is a deficient number, since it is larger than the sum of its proper divisors (5519439).

12318381 is a wasteful number, since it uses less digits than its factorization.

12318381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436 (or 3433 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12318381 is about 3509.7551196629. The cubic root of 12318381 is about 230.9499526142.

The spelling of 12318381 in words is "twelve million, three hundred eighteen thousand, three hundred eighty-one".