12939217 has 2 divisors, whose sum is σ = 12939218. Its totient is φ = 12939216.

The previous prime is 12939203. The next prime is 12939257. The reversal of 12939217 is 71293921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8116801 + 4822416 = 2849^2 + 2196^2 .

It is a cyclic number.

It is not a de Polignac number, because 12939217 - 2¹⁵ = 12906449 is a prime.

It is not a weakly prime, because it can be changed into another prime (12939257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6469608 + 6469609.

It is an arithmetic number, because the mean of its divisors is an integer number (6469609).

Almost surely, 2^12939217 is an apocalyptic number.

It is an amenable number.

12939217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12939217 is an equidigital number, since it uses as much as digits as its factorization.

12939217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 12939217 is about 3597.1123140653. The cubic root of 12939217 is about 234.7664315801.

The spelling of 12939217 in words is "twelve million, nine hundred thirty-nine thousand, two hundred seventeen".