12640393 has 2 divisors, whose sum is σ = 12640394. Its totient is φ = 12640392.

The previous prime is 12640373. The next prime is 12640399. The reversal of 12640393 is 39304621.

12640393 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11888704 + 751689 = 3448^2 + 867^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640393 - 2⁹ = 12639881 is a prime.

It is not a weakly prime, because it can be changed into another prime (12640399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320196 + 6320197.

It is an arithmetic number, because the mean of its divisors is an integer number (6320197).

Almost surely, 2^12640393 is an apocalyptic number.

It is an amenable number.

12640393 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640393 is an equidigital number, since it uses as much as digits as its factorization.

12640393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 12640393 is about 3555.3330364398. Note that the first 3 decimals coincide. The cubic root of 12640393 is about 232.9450710773.

The spelling of 12640393 in words is "twelve million, six hundred forty thousand, three hundred ninety-three".