12356381 has 2 divisors, whose sum is σ = 12356382. Its totient is φ = 12356380.

The previous prime is 12356329. The next prime is 12356387. The reversal of 12356381 is 18365321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 1156 = 3515^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 12356381 - 2⁶ = 12356317 is a prime.

It is a super-2 number, since 2×12356381² = 305360302834322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12356387) 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, 6178190 + 6178191.

It is an arithmetic number, because the mean of its divisors is an integer number (6178191).

Almost surely, 2^12356381 is an apocalyptic number.

It is an amenable number.

12356381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12356381 is an equidigital number, since it uses as much as digits as its factorization.

12356381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 12356381 is about 3515.1644342762. The cubic root of 12356381 is about 231.1871885898.

The spelling of 12356381 in words is "twelve million, three hundred fifty-six thousand, three hundred eighty-one".