12783681 has 12 divisors (see below), whose sum is σ = 18542160. Its totient is φ = 8487000.

The previous prime is 12783679. The next prime is 12783697. The reversal of 12783681 is 18638721.

It is not a de Polignac number, because 12783681 - 2¹ = 12783679 is a prime.

It is a super-2 number, since 2×12783681² = 326844999819522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12785681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 571 + ... + 5088.

It is an arithmetic number, because the mean of its divisors is an integer number (1545180).

Almost surely, 2^12783681 is an apocalyptic number.

It is an amenable number.

12783681 is a deficient number, since it is larger than the sum of its proper divisors (5758479).

12783681 is a wasteful number, since it uses less digits than its factorization.

12783681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5916 (or 5913 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12783681 is about 3575.4273870406. The cubic root of 12783681 is about 233.8219662688.

The spelling of 12783681 in words is "twelve million, seven hundred eighty-three thousand, six hundred eighty-one".