138805880 has 32 divisors (see below), whose sum is σ = 316083600. Its totient is φ = 54852096.

The previous prime is 138805871. The next prime is 138805903. The reversal of 138805880 is 88508831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17585 + ... + 24224.

Almost surely, 2^138805880 is an apocalyptic number.

138805880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138805880 is an abundant number, since it is smaller than the sum of its proper divisors (177277720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138805880 is a wasteful number, since it uses less digits than its factorization.

138805880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41903 (or 41899 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The square root of 138805880 is about 11781.5907245159. The cubic root of 138805880 is about 517.7688925978.

The spelling of 138805880 in words is "one hundred thirty-eight million, eight hundred five thousand, eight hundred eighty".