12640307 has 2 divisors, whose sum is σ = 12640308. Its totient is φ = 12640306.

The previous prime is 12640297. The next prime is 12640351. The reversal of 12640307 is 70304621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12640307 - 2⁴ = 12640291 is a prime.

It is a super-2 number, since 2×12640307² = 319554722108498, which contains 22 as substring.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (12640207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320153 + 6320154.

It is an arithmetic number, because the mean of its divisors is an integer number (6320154).

Almost surely, 2^12640307 is an apocalyptic number.

12640307 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640307 is an equidigital number, since it uses as much as digits as its factorization.

12640307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 12640307 is about 3555.3209419123. The cubic root of 12640307 is about 232.9445427889.

Adding to 12640307 its reverse (70304621), we get a palindrome (82944928).

The spelling of 12640307 in words is "twelve million, six hundred forty thousand, three hundred seven".