12643635 has 16 divisors (see below), whose sum is σ = 20301984. Its totient is φ = 6719232.

The previous prime is 12643619. The next prime is 12643643. The reversal of 12643635 is 53634621.

12643635 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12643635 - 2⁴ = 12643619 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3349 + ... + 6041.

It is an arithmetic number, because the mean of its divisors is an integer number (1268874).

Almost surely, 2^12643635 is an apocalyptic number.

12643635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12643635 is a deficient number, since it is larger than the sum of its proper divisors (7658349).

12643635 is a wasteful number, since it uses less digits than its factorization.

12643635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014.

The product of its digits is 12960, while the sum is 30.

The square root of 12643635 is about 3555.7889419930. The cubic root of 12643635 is about 232.9649845765.

The spelling of 12643635 in words is "twelve million, six hundred forty-three thousand, six hundred thirty-five".