12959665 has 16 divisors (see below), whose sum is σ = 16228800. Its totient is φ = 9922752.

The previous prime is 12959663. The next prime is 12959669. The reversal of 12959665 is 56695921.

12959665 = T₁₄₂ + T₁₄₃ + ... + T₄₃₁.

It is a cyclic number.

It is not a de Polignac number, because 12959665 - 2¹ = 12959663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12959663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19834 + ... + 20476.

It is an arithmetic number, because the mean of its divisors is an integer number (1014300).

Almost surely, 2^12959665 is an apocalyptic number.

It is an amenable number.

12959665 is a deficient number, since it is larger than the sum of its proper divisors (3269135).

12959665 is a wasteful number, since it uses less digits than its factorization.

12959665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its digits is 145800, while the sum is 43.

The square root of 12959665 is about 3599.9534719215. The cubic root of 12959665 is about 234.8900345628.

The spelling of 12959665 in words is "twelve million, nine hundred fifty-nine thousand, six hundred sixty-five".