12927781940 has 12 divisors (see below), whose sum is σ = 27148342116. Its totient is φ = 5171112768.

The previous prime is 12927781939. The next prime is 12927781967. The reversal of 12927781940 is 4918772921.

It can be written as a sum of positive squares in 2 ways, for example, as 5737759504 + 7190022436 = 75748^2 + 84794^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323194529 + ... + 323194568.

It is an arithmetic number, because the mean of its divisors is an integer number (2262361843).

Almost surely, 2^12927781940 is an apocalyptic number.

12927781940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12927781940 is an abundant number, since it is smaller than the sum of its proper divisors (14220560176).

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

12927781940 is a wasteful number, since it uses less digits than its factorization.

12927781940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646389106 (or 646389104 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 12927781940 in words is "twelve billion, nine hundred twenty-seven million, seven hundred eighty-one thousand, nine hundred forty".