12900643 has 4 divisors (see below), whose sum is σ = 14743600. Its totient is φ = 11057688.

The previous prime is 12900623. The next prime is 12900661. The reversal of 12900643 is 34600921.

12900643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12900643 - 2⁹ = 12900131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12900623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921468 + ... + 921481.

It is an arithmetic number, because the mean of its divisors is an integer number (3685900).

Almost surely, 2^12900643 is an apocalyptic number.

12900643 is a deficient number, since it is larger than the sum of its proper divisors (1842957).

12900643 is an equidigital number, since it uses as much as digits as its factorization.

12900643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842956.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 12900643 is about 3591.7465111001. The cubic root of 12900643 is about 234.5329065194.

The spelling of 12900643 in words is "twelve million, nine hundred thousand, six hundred forty-three".