12957381 has 8 divisors (see below), whose sum is σ = 19196160. Its totient is φ = 8638236.

The previous prime is 12957361. The next prime is 12957389. The reversal of 12957381 is 18375921.

12957381 is a `hidden beast` number, since 1 + 2 + 9 + 573 + 81 = 666.

It is not a de Polignac number, because 12957381 - 2⁶ = 12957317 is a prime.

It is a super-2 number, since 2×12957381² = 335787444758322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12957389) 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 7 ways as a sum of consecutive naturals, for example, 239925 + ... + 239978.

It is an arithmetic number, because the mean of its divisors is an integer number (2399520).

Almost surely, 2^12957381 is an apocalyptic number.

It is an amenable number.

12957381 is a deficient number, since it is larger than the sum of its proper divisors (6238779).

12957381 is an equidigital number, since it uses as much as digits as its factorization.

12957381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479912 (or 479906 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 12957381 is about 3599.6362316212. The cubic root of 12957381 is about 234.8762348141.

The spelling of 12957381 in words is "twelve million, nine hundred fifty-seven thousand, three hundred eighty-one".