12781438972 has 24 divisors (see below), whose sum is σ = 22584531200. Its totient is φ = 6328777536.

The previous prime is 12781438963. The next prime is 12781438979. The reversal of 12781438972 is 27983418721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781438979) 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, 969658 + ... + 982750.

Almost surely, 2^12781438972 is an apocalyptic number.

It is an amenable number.

12781438972 is a deficient number, since it is larger than the sum of its proper divisors (9803092228).

12781438972 is a wasteful number, since it uses less digits than its factorization.

12781438972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15445 (or 15443 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 52.

The spelling of 12781438972 in words is "twelve billion, seven hundred eighty-one million, four hundred thirty-eight thousand, nine hundred seventy-two".