12640859 has 16 divisors (see below), whose sum is σ = 15864576. Its totient is φ = 9784800.

The previous prime is 12640841. The next prime is 12640867. The reversal of 12640859 is 95804621.

It is a cyclic number.

It is not a de Polignac number, because 12640859 - 2¹⁶ = 12575323 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12640819) 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 15 ways as a sum of consecutive naturals, for example, 13484 + ... + 14390.

It is an arithmetic number, because the mean of its divisors is an integer number (991536).

Almost surely, 2^12640859 is an apocalyptic number.

12640859 is a deficient number, since it is larger than the sum of its proper divisors (3223717).

12640859 is a wasteful number, since it uses less digits than its factorization.

12640859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 12640859 is about 3555.3985711872. The cubic root of 12640859 is about 232.9479336220.

The spelling of 12640859 in words is "twelve million, six hundred forty thousand, eight hundred fifty-nine".