12940381 has 2 divisors, whose sum is σ = 12940382. Its totient is φ = 12940380.

The previous prime is 12940363. The next prime is 12940393. The reversal of 12940381 is 18304921.

It is a happy number.

12940381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10791225 + 2149156 = 3285^2 + 1466^2 .

It is an emirp because it is prime and its reverse (18304921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12940381 - 2⁷ = 12940253 is a prime.

It is a super-2 number, since 2×12940381² = 334906920850322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12944381) 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 as a sum of consecutive naturals, namely, 6470190 + 6470191.

It is an arithmetic number, because the mean of its divisors is an integer number (6470191).

Almost surely, 2^12940381 is an apocalyptic number.

It is an amenable number.

12940381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12940381 is an equidigital number, since it uses as much as digits as its factorization.

12940381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 12940381 is about 3597.2741068759. The cubic root of 12940381 is about 234.7734711594.

The spelling of 12940381 in words is "twelve million, nine hundred forty thousand, three hundred eighty-one".