138986618 has 16 divisors (see below), whose sum is σ = 218712960. Its totient is φ = 66150000.

The previous prime is 138986593. The next prime is 138986623. The reversal of 138986618 is 816689831.

It is a happy number.

It is an unprimeable number.

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, 12758 + ... + 20993.

It is an arithmetic number, because the mean of its divisors is an integer number (13669560).

Almost surely, 2^138986618 is an apocalyptic number.

138986618 is a deficient number, since it is larger than the sum of its proper divisors (79726342).

138986618 is a wasteful number, since it uses less digits than its factorization.

138986618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33853.

The product of its digits is 497664, while the sum is 50.

The square root of 138986618 is about 11789.2585856787. The cubic root of 138986618 is about 517.9935226751.

The spelling of 138986618 in words is "one hundred thirty-eight million, nine hundred eighty-six thousand, six hundred eighteen".