12781612 has 6 divisors (see below), whose sum is σ = 22367828. Its totient is φ = 6390804.

The previous prime is 12781609. The next prime is 12781619. The reversal of 12781612 is 21618721.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12781619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597698 + ... + 1597705.

Almost surely, 2^12781612 is an apocalyptic number.

It is an amenable number.

12781612 is a deficient number, since it is larger than the sum of its proper divisors (9586216).

12781612 is a wasteful number, since it uses less digits than its factorization.

12781612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195407 (or 3195405 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 12781612 is about 3575.1380392930. The cubic root of 12781612 is about 233.8093511295.

The spelling of 12781612 in words is "twelve million, seven hundred eighty-one thousand, six hundred twelve".