138923780989 has 32 divisors (see below), whose sum is σ = 171657674496. Its totient is φ = 109729935360.

The previous prime is 138923780987. The next prime is 138923781001. The reversal of 138923780989 is 989087329831.

It is not a de Polignac number, because 138923780989 - 2¹ = 138923780987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138923780987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1131754 + ... + 1248484.

It is an arithmetic number, because the mean of its divisors is an integer number (5364302328).

Almost surely, 2^138923780989 is an apocalyptic number.

It is an amenable number.

138923780989 is a deficient number, since it is larger than the sum of its proper divisors (32733893507).

138923780989 is a wasteful number, since it uses less digits than its factorization.

138923780989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116965.

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 138923780989 in words is "one hundred thirty-eight billion, nine hundred twenty-three million, seven hundred eighty thousand, nine hundred eighty-nine".