138930291778 has 16 divisors (see below), whose sum is σ = 210183704640. Its totient is φ = 68870433456.

The previous prime is 138930291757. The next prime is 138930291779. The reversal of 138930291778 is 877192039831.

It is not an unprimeable number, because it can be changed into a prime (138930291779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141601 + ... + 545812.

It is an arithmetic number, because the mean of its divisors is an integer number (13136481540).

Almost surely, 2^138930291778 is an apocalyptic number.

138930291778 is a deficient number, since it is larger than the sum of its proper divisors (71253412862).

138930291778 is a wasteful number, since it uses less digits than its factorization.

138930291778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688281.

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 138930291778 in words is "one hundred thirty-eight billion, nine hundred thirty million, two hundred ninety-one thousand, seven hundred seventy-eight".