12640297 has 2 divisors, whose sum is σ = 12640298. Its totient is φ = 12640296.

The previous prime is 12640291. The next prime is 12640307. The reversal of 12640297 is 79204621.

12640297 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10265616 + 2374681 = 3204^2 + 1541^2 .

It is an emirp because it is prime and its reverse (79204621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12640297 is a prime.

It is equal to p₈₂₇₂₉₃ and since 12640297 and 827293 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 (12640291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320148 + 6320149.

It is an arithmetic number, because the mean of its divisors is an integer number (6320149).

Almost surely, 2^12640297 is an apocalyptic number.

It is an amenable number.

12640297 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640297 is an equidigital number, since it uses as much as digits as its factorization.

12640297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 12640297 is about 3555.3195355692. The cubic root of 12640297 is about 232.9444813598.

The spelling of 12640297 in words is "twelve million, six hundred forty thousand, two hundred ninety-seven".