12939257 has 2 divisors, whose sum is σ = 12939258. Its totient is φ = 12939256.

The previous prime is 12939217. The next prime is 12939287. The reversal of 12939257 is 75293921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 414736 = 3539^2 + 644^2 .

It is a cyclic number.

It is not a de Polignac number, because 12939257 - 2¹² = 12935161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12939257.

It is not a weakly prime, because it can be changed into another prime (12939217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6469628 + 6469629.

It is an arithmetic number, because the mean of its divisors is an integer number (6469629).

Almost surely, 2^12939257 is an apocalyptic number.

It is an amenable number.

12939257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12939257 is an equidigital number, since it uses as much as digits as its factorization.

12939257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 38.

The square root of 12939257 is about 3597.1178740764. The cubic root of 12939257 is about 234.7666734970.

It can be divided in two parts, 129 and 39257, that multiplied together give a triangular number (5064153 = T₃₁₈₂).

The spelling of 12939257 in words is "twelve million, nine hundred thirty-nine thousand, two hundred fifty-seven".