38972843865 has 12 divisors (see below), whose sum is σ = 67552929444. Its totient is φ = 20785516704.

The previous prime is 38972843863. The next prime is 38972843887. The reversal of 38972843865 is 56834827983.

38972843865 is a `hidden beast` number, since 38 + 97 + 28 + 438 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7315894089 + 31656949776 = 85533^2 + 177924^2 .

It is not a de Polignac number, because 38972843865 - 2¹ = 38972843863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38972843863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433031554 + ... + 433031643.

It is an arithmetic number, because the mean of its divisors is an integer number (5629410787).

Almost surely, 2^38972843865 is an apocalyptic number.

It is an amenable number.

38972843865 is a deficient number, since it is larger than the sum of its proper divisors (28580085579).

38972843865 is a wasteful number, since it uses less digits than its factorization.

38972843865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866063208 (or 866063205 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 38972843865 in words is "thirty-eight billion, nine hundred seventy-two million, eight hundred forty-three thousand, eight hundred sixty-five".