12821766 has 16 divisors (see below), whose sum is σ = 26269488. Its totient is φ = 4169600.

The previous prime is 12821761. The next prime is 12821801. The reversal of 12821766 is 66712821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25815 + ... + 26306.

It is an arithmetic number, because the mean of its divisors is an integer number (1641843).

Almost surely, 2^12821766 is an apocalyptic number.

12821766 is an abundant number, since it is smaller than the sum of its proper divisors (13447722).

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

12821766 is a wasteful number, since it uses less digits than its factorization.

12821766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52167.

The product of its digits is 8064, while the sum is 33.

The square root of 12821766 is about 3580.7493629127. The cubic root of 12821766 is about 234.0539359928.

The spelling of 12821766 in words is "twelve million, eight hundred twenty-one thousand, seven hundred sixty-six".