12640817 has 8 divisors (see below), whose sum is σ = 14621376. Its totient is φ = 10703952.

The previous prime is 12640807. The next prime is 12640819. The reversal of 12640817 is 71804621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12640817 - 2⁸ = 12640561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12640817.

It is not an unprimeable number, because it can be changed into a prime (12640819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10298 + ... + 11459.

It is an arithmetic number, because the mean of its divisors is an integer number (1827672).

Almost surely, 2^12640817 is an apocalyptic number.

It is an amenable number.

12640817 is a deficient number, since it is larger than the sum of its proper divisors (1980559).

12640817 is an equidigital number, since it uses as much as digits as its factorization.

12640817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21847.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 12640817 is about 3555.3926646715. The cubic root of 12640817 is about 232.9476756273.

The spelling of 12640817 in words is "twelve million, six hundred forty thousand, eight hundred seventeen".