138923780990 has 32 divisors (see below), whose sum is σ = 258428952576. Its totient is φ = 53714530080.

The previous prime is 138923780987. The next prime is 138923781001. The reversal of 138923780990 is 99087329831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7889 + ... + 527171.

It is an arithmetic number, because the mean of its divisors is an integer number (8075904768).

Almost surely, 2^138923780990 is an apocalyptic number.

138923780990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138923780990 is a deficient number, since it is larger than the sum of its proper divisors (119505171586).

138923780990 is a wasteful number, since it uses less digits than its factorization.

138923780990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520184.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 138923780990 in words is "one hundred thirty-eight billion, nine hundred twenty-three million, seven hundred eighty thousand, nine hundred ninety".