138630886 has 16 divisors (see below), whose sum is σ = 222133104. Its totient is φ = 64658944.

The previous prime is 138630851. The next prime is 138630889. The reversal of 138630886 is 688036831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138630889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14200 + ... + 21883.

It is an arithmetic number, because the mean of its divisors is an integer number (13883319).

Almost surely, 2^138630886 is an apocalyptic number.

138630886 is a deficient number, since it is larger than the sum of its proper divisors (83502218).

138630886 is a wasteful number, since it uses less digits than its factorization.

138630886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36215.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 138630886 is about 11774.1617960685. The cubic root of 138630886 is about 517.5512155742.

The spelling of 138630886 in words is "one hundred thirty-eight million, six hundred thirty thousand, eight hundred eighty-six".