12729805 has 24 divisors (see below), whose sum is σ = 17150616. Its totient is φ = 9060480.

The previous prime is 12729797. The next prime is 12729817. The reversal of 12729805 is 50892721.

It can be written as a sum of positive squares in 4 ways, for example, as 3175524 + 9554281 = 1782^2 + 3091^2 .

It is not a de Polignac number, because 12729805 - 2³ = 12729797 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 31867 + ... + 32263.

It is an arithmetic number, because the mean of its divisors is an integer number (714609).

Almost surely, 2^12729805 is an apocalyptic number.

It is an amenable number.

12729805 is a deficient number, since it is larger than the sum of its proper divisors (4420811).

12729805 is a wasteful number, since it uses less digits than its factorization.

12729805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 12729805 is about 3567.8852279747. The cubic root of 12729805 is about 233.4930278675.

The spelling of 12729805 in words is "twelve million, seven hundred twenty-nine thousand, eight hundred five".