12640373 has 2 divisors, whose sum is σ = 12640374. Its totient is φ = 12640372.

The previous prime is 12640351. The next prime is 12640393. The reversal of 12640373 is 37304621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7879249 + 4761124 = 2807^2 + 2182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12640373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320186 + 6320187.

It is an arithmetic number, because the mean of its divisors is an integer number (6320187).

Almost surely, 2^12640373 is an apocalyptic number.

It is an amenable number.

12640373 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640373 is an equidigital number, since it uses as much as digits as its factorization.

12640373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 12640373 is about 3555.3302237626. The cubic root of 12640373 is about 232.9449482198.

Adding to 12640373 its reverse (37304621), we get a palindrome (49944994).

The spelling of 12640373 in words is "twelve million, six hundred forty thousand, three hundred seventy-three".