12640959 has 12 divisors (see below), whose sum is σ = 18295056. Its totient is φ = 8410752.

The previous prime is 12640951. The next prime is 12640967. The reversal of 12640959 is 95904621.

12640959 is a `hidden beast` number, since 1 + 2 + 640 + 9 + 5 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (12640951) and next prime (12640967).

It is not a de Polignac number, because 12640959 - 2³ = 12640951 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5014 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (1524588).

Almost surely, 2^12640959 is an apocalyptic number.

12640959 is a deficient number, since it is larger than the sum of its proper divisors (5654097).

12640959 is a wasteful number, since it uses less digits than its factorization.

12640959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766 (or 2763 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 12640959 is about 3555.4126342803. The cubic root of 12640959 is about 232.9485478928.

The spelling of 12640959 in words is "twelve million, six hundred forty thousand, nine hundred fifty-nine".