12427139 has 2 divisors, whose sum is σ = 12427140. Its totient is φ = 12427138.

The previous prime is 12427117. The next prime is 12427147. The reversal of 12427139 is 93172421.

It is a strong prime.

It is an emirp because it is prime and its reverse (93172421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12427139 is a prime.

It is equal to p₈₁₄₂₈₆ and since 12427139 and 814286 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12427169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6213569 + 6213570.

It is an arithmetic number, because the mean of its divisors is an integer number (6213570).

Almost surely, 2^12427139 is an apocalyptic number.

12427139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12427139 is an equidigital number, since it uses as much as digits as its factorization.

12427139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 12427139 is about 3525.2147452318. The cubic root of 12427139 is about 231.6276416388.

The spelling of 12427139 in words is "twelve million, four hundred twenty-seven thousand, one hundred thirty-nine".