12820472838 has 12 divisors (see below), whose sum is σ = 27777691188. Its totient is φ = 4273490940.

The previous prime is 12820472759. The next prime is 12820472839. The reversal of 12820472838 is 83827402821.

12820472838 is a `hidden beast` number, since 128 + 20 + 472 + 8 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12820472793 and 12820472802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820472839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 356124228 + ... + 356124263.

It is an arithmetic number, because the mean of its divisors is an integer number (2314807599).

Almost surely, 2^12820472838 is an apocalyptic number.

12820472838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12820472838 is an abundant number, since it is smaller than the sum of its proper divisors (14957218350).

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

12820472838 is a wasteful number, since it uses less digits than its factorization.

12820472838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712248499 (or 712248496 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 12820472838 in words is "twelve billion, eight hundred twenty million, four hundred seventy-two thousand, eight hundred thirty-eight".