12726865 has 8 divisors (see below), whose sum is σ = 16076160. Its totient is φ = 9645552.

The previous prime is 12726841. The next prime is 12726869. The reversal of 12726865 is 56862721.

12726865 = 276² + 277² + ... + 389².

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12726865 - 2²¹ = 10629713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12726869) 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, 66889 + ... + 67078.

It is an arithmetic number, because the mean of its divisors is an integer number (2009520).

Almost surely, 2^12726865 is an apocalyptic number.

It is an amenable number.

12726865 is a deficient number, since it is larger than the sum of its proper divisors (3349295).

12726865 is a wasteful number, since it uses less digits than its factorization.

12726865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133991.

The product of its digits is 40320, while the sum is 37.

The square root of 12726865 is about 3567.4731954144. The cubic root of 12726865 is about 233.4750510968.

The spelling of 12726865 in words is "twelve million, seven hundred twenty-six thousand, eight hundred sixty-five".