12739897 has 2 divisors, whose sum is σ = 12739898. Its totient is φ = 12739896.

The previous prime is 12739879. The next prime is 12739927. The reversal of 12739897 is 79893721.

It is a happy number.

Together with previous prime (12739879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11431161 + 1308736 = 3381^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 12739897 - 2¹⁵ = 12707129 is a prime.

It is not a weakly prime, because it can be changed into another prime (12739847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6369948 + 6369949.

It is an arithmetic number, because the mean of its divisors is an integer number (6369949).

Almost surely, 2^12739897 is an apocalyptic number.

It is an amenable number.

12739897 is a deficient number, since it is larger than the sum of its proper divisors (1).

12739897 is an equidigital number, since it uses as much as digits as its factorization.

12739897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 12739897 is about 3569.2992309416. The cubic root of 12739897 is about 233.5547148350.

The spelling of 12739897 in words is "twelve million, seven hundred thirty-nine thousand, eight hundred ninety-seven".