12643705 has 16 divisors (see below), whose sum is σ = 15634944. Its totient is φ = 9810880.

The previous prime is 12643669. The next prime is 12643717. The reversal of 12643705 is 50734621.

12643705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12643705 - 2⁹ = 12643193 is a prime.

It is a super-2 number, since 2×12643705² = 319726552254050, which contains 22 as substring.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 40500 + ... + 40810.

It is an arithmetic number, because the mean of its divisors is an integer number (977184).

Almost surely, 2^12643705 is an apocalyptic number.

It is an amenable number.

12643705 is a deficient number, since it is larger than the sum of its proper divisors (2991239).

12643705 is a wasteful number, since it uses less digits than its factorization.

12643705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 12643705 is about 3555.7987850833. The cubic root of 12643705 is about 232.9654145034.

The spelling of 12643705 in words is "twelve million, six hundred forty-three thousand, seven hundred five".