12427861 has 2 divisors, whose sum is σ = 12427862. Its totient is φ = 12427860.

The previous prime is 12427859. The next prime is 12427873. The reversal of 12427861 is 16872421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 656100 = 3431^2 + 810^2 .

It is an emirp because it is prime and its reverse (16872421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12427861 - 2¹ = 12427859 is a prime.

Together with 12427859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12427841) 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, 6213930 + 6213931.

It is an arithmetic number, because the mean of its divisors is an integer number (6213931).

Almost surely, 2^12427861 is an apocalyptic number.

It is an amenable number.

12427861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12427861 is an equidigital number, since it uses as much as digits as its factorization.

12427861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 12427861 is about 3525.3171488534. The cubic root of 12427861 is about 231.6321273031.

The spelling of 12427861 in words is "twelve million, four hundred twenty-seven thousand, eight hundred sixty-one".