12771816 has 16 divisors (see below), whose sum is σ = 31929600. Its totient is φ = 4257264.

The previous prime is 12771809. The next prime is 12771821. The reversal of 12771816 is 61817721.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 266056 + ... + 266103.

It is an arithmetic number, because the mean of its divisors is an integer number (1995600).

Almost surely, 2^12771816 is an apocalyptic number.

It is an amenable number.

12771816 is an abundant number, since it is smaller than the sum of its proper divisors (19157784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12771816 is a wasteful number, since it uses less digits than its factorization.

12771816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532168 (or 532164 counting only the distinct ones).

The product of its digits is 4704, while the sum is 33.

The square root of 12771816 is about 3573.7677596621. The cubic root of 12771816 is about 233.7496043155.

The spelling of 12771816 in words is "twelve million, seven hundred seventy-one thousand, eight hundred sixteen".