138935678931 has 18 divisors (see below), whose sum is σ = 233449746972. Its totient is φ = 79391816280.

The previous prime is 138935678911. The next prime is 138935678933. The reversal of 138935678931 is 139876539831.

138935678931 is a `hidden beast` number, since 1 + 38 + 9 + 3 + 567 + 8 + 9 + 31 = 666.

138935678931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138935678931 - 2¹¹ = 138935676883 is a prime.

It is a super-2 number, since 2×138935678931² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (138935678933) 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 17 ways as a sum of consecutive naturals, for example, 157523005 + ... + 157523886.

Almost surely, 2^138935678931 is an apocalyptic number.

138935678931 is a deficient number, since it is larger than the sum of its proper divisors (94514068041).

138935678931 is a wasteful number, since it uses less digits than its factorization.

138935678931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315046911 (or 315046901 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 138935678931 in words is "one hundred thirty-eight billion, nine hundred thirty-five million, six hundred seventy-eight thousand, nine hundred thirty-one".