138888895 has 8 divisors (see below), whose sum is σ = 176470704. Its totient is φ = 104575104.

The previous prime is 138888857. The next prime is 138888907. The reversal of 138888895 is 598888831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138888895 - 2⁷ = 138888767 is a prime.

It is a Duffinian 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, 816909 + ... + 817078.

It is an arithmetic number, because the mean of its divisors is an integer number (22058838).

Almost surely, 2^138888895 is an apocalyptic number.

138888895 is a deficient number, since it is larger than the sum of its proper divisors (37581809).

138888895 is a wasteful number, since it uses less digits than its factorization.

138888895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634009.

The product of its digits is 4423680, while the sum is 58.

The square root of 138888895 is about 11785.1132790483. The cubic root of 138888895 is about 517.8720919211.

The spelling of 138888895 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-five".