12787643 has 6 divisors (see below), whose sum is σ = 14055972. Its totient is φ = 11625020.

The previous prime is 12787639. The next prime is 12787667. The reversal of 12787643 is 34678721.

It is not a de Polignac number, because 12787643 - 2² = 12787639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12787597 and 12787606.

It is not an unprimeable number, because it can be changed into a prime (12787633) 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, 52721 + ... + 52962.

It is an arithmetic number, because the mean of its divisors is an integer number (2342662).

Almost surely, 2^12787643 is an apocalyptic number.

12787643 is a deficient number, since it is larger than the sum of its proper divisors (1268329).

12787643 is a wasteful number, since it uses less digits than its factorization.

12787643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105705 (or 105694 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 12787643 is about 3575.9814037548. The cubic root of 12787643 is about 233.8461196391.

The spelling of 12787643 in words is "twelve million, seven hundred eighty-seven thousand, six hundred forty-three".