12740257 has 2 divisors, whose sum is σ = 12740258. Its totient is φ = 12740256.

The previous prime is 12740249. The next prime is 12740267. The reversal of 12740257 is 75204721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 59536 = 3561^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 12740257 - 2³ = 12740249 is a prime.

It is not a weakly prime, because it can be changed into another prime (12740267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6370128 + 6370129.

It is an arithmetic number, because the mean of its divisors is an integer number (6370129).

Almost surely, 2^12740257 is an apocalyptic number.

It is an amenable number.

12740257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12740257 is an equidigital number, since it uses as much as digits as its factorization.

12740257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 12740257 is about 3569.3496606525. The cubic root of 12740257 is about 233.5569147195.

Adding to 12740257 its reverse (75204721), we get a palindrome (87944978).

The spelling of 12740257 in words is "twelve million, seven hundred forty thousand, two hundred fifty-seven".