12339381 has 4 divisors (see below), whose sum is σ = 16452512. Its totient is φ = 8226252.

The previous prime is 12339377. The next prime is 12339403. The reversal of 12339381 is 18393321.

12339381 is digitally balanced in base 2, base 3 and base 4, because in such bases 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 12339381 - 2² = 12339377 is a prime.

It is a super-2 number, since 2×12339381² = 304520646926322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12339311) 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, 2056561 + ... + 2056566.

It is an arithmetic number, because the mean of its divisors is an integer number (4113128).

Almost surely, 2^12339381 is an apocalyptic number.

It is an amenable number.

12339381 is a deficient number, since it is larger than the sum of its proper divisors (4113131).

12339381 is an equidigital number, since it uses as much as digits as its factorization.

12339381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113130.

The product of its digits is 3888, while the sum is 30.

The square root of 12339381 is about 3512.7455074343. The cubic root of 12339381 is about 231.0811169178.

It can be divided in two parts, 12339 and 381, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 12339381 in words is "twelve million, three hundred thirty-nine thousand, three hundred eighty-one".