12382781 has 2 divisors, whose sum is σ = 12382782. Its totient is φ = 12382780.

The previous prime is 12382759. The next prime is 12382787. The reversal of 12382781 is 18728321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 27556 = 3515^2 + 166^2 .

It is an emirp because it is prime and its reverse (18728321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12382781 - 2¹⁰ = 12381757 is a prime.

It is a super-2 number, since 2×12382781² = 306666530587922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12382787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6191390 + 6191391.

It is an arithmetic number, because the mean of its divisors is an integer number (6191391).

Almost surely, 2^12382781 is an apocalyptic number.

It is an amenable number.

12382781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12382781 is an equidigital number, since it uses as much as digits as its factorization.

12382781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 12382781 is about 3518.9175892595. The cubic root of 12382781 is about 231.3517189712.

The spelling of 12382781 in words is "twelve million, three hundred eighty-two thousand, seven hundred eighty-one".