12640375 has 32 divisors (see below), whose sum is σ = 17858880. Its totient is φ = 8848000.

The previous prime is 12640373. The next prime is 12640393. The reversal of 12640375 is 57304621.

It is not a de Polignac number, because 12640375 - 2¹ = 12640373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39717 + ... + 40033.

It is an arithmetic number, because the mean of its divisors is an integer number (558090).

Almost surely, 2^12640375 is an apocalyptic number.

12640375 is a deficient number, since it is larger than the sum of its proper divisors (5218505).

12640375 is a wasteful number, since it uses less digits than its factorization.

12640375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 12640375 is about 3555.3305050304. The cubic root of 12640375 is about 232.9449605055.

Adding to 12640375 its reverse (57304621), we get a palindrome (69944996).

The spelling of 12640375 in words is "twelve million, six hundred forty thousand, three hundred seventy-five".