12783855 has 24 divisors (see below), whose sum is σ = 23794992. Its totient is φ = 5843712.

The previous prime is 12783853. The next prime is 12783863. The reversal of 12783855 is 55838721.

12783855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12783855 - 2¹ = 12783853 is a prime.

It is a super-2 number, since 2×12783855² = 326853897322050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12783851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7962 + ... + 9431.

It is an arithmetic number, because the mean of its divisors is an integer number (991458).

Almost surely, 2^12783855 is an apocalyptic number.

12783855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12783855 is a deficient number, since it is larger than the sum of its proper divisors (11011137).

12783855 is a wasteful number, since it uses less digits than its factorization.

12783855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17415 (or 17408 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 12783855 is about 3575.4517197132. The cubic root of 12783855 is about 233.8230271223.

The spelling of 12783855 in words is "twelve million, seven hundred eighty-three thousand, eight hundred fifty-five".