12771855 has 24 divisors (see below), whose sum is σ = 22221888. Its totient is φ = 6785856.

The previous prime is 12771853. The next prime is 12771883. The reversal of 12771855 is 55817721.

It is not a de Polignac number, because 12771855 - 2¹ = 12771853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12771853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20529 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (925912).

Almost surely, 2^12771855 is an apocalyptic number.

12771855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12771855 is a deficient number, since it is larger than the sum of its proper divisors (9450033).

12771855 is a wasteful number, since it uses less digits than its factorization.

12771855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087 (or 1084 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 12771855 is about 3573.7732160841. The cubic root of 12771855 is about 233.7498422411.

The spelling of 12771855 in words is "twelve million, seven hundred seventy-one thousand, eight hundred fifty-five".