12738381 has 4 divisors (see below), whose sum is σ = 16984512. Its totient is φ = 8492252.

The previous prime is 12738373. The next prime is 12738419. The reversal of 12738381 is 18383721.

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 a cyclic number.

It is not a de Polignac number, because 12738381 - 2³ = 12738373 is a prime.

It is a super-2 number, since 2×12738381² = 324532701002322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12738301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123061 + ... + 2123066.

It is an arithmetic number, because the mean of its divisors is an integer number (4246128).

Almost surely, 2^12738381 is an apocalyptic number.

It is an amenable number.

12738381 is a deficient number, since it is larger than the sum of its proper divisors (4246131).

12738381 is an equidigital number, since it uses as much as digits as its factorization.

12738381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246130.

The product of its digits is 8064, while the sum is 33.

The square root of 12738381 is about 3569.0868580072. The cubic root of 12738381 is about 233.5454504223.

The spelling of 12738381 in words is "twelve million, seven hundred thirty-eight thousand, three hundred eighty-one".