12812643 has 6 divisors (see below), whose sum is σ = 18507164. Its totient is φ = 8541756.

The previous prime is 12812629. The next prime is 12812647. The reversal of 12812643 is 34621821.

12812643 is a `hidden beast` number, since 1 + 2 + 8 + 12 + 643 = 666.

It is not a de Polignac number, because 12812643 - 2²² = 8618339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12812647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 711805 + ... + 711822.

Almost surely, 2^12812643 is an apocalyptic number.

12812643 is a deficient number, since it is larger than the sum of its proper divisors (5694521).

12812643 is a wasteful number, since it uses less digits than its factorization.

12812643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423633 (or 1423630 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 12812643 is about 3579.4752408698. The cubic root of 12812643 is about 233.9984111222.

The spelling of 12812643 in words is "twelve million, eight hundred twelve thousand, six hundred forty-three".