138659618 has 16 divisors (see below), whose sum is σ = 210643200. Its totient is φ = 68450976.

The previous prime is 138659611. The next prime is 138659681. The reversal of 138659618 is 816956831.

It is not an unprimeable number, because it can be changed into a prime (138659611) by changing a digit.

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, 53255 + ... + 55797.

It is an arithmetic number, because the mean of its divisors is an integer number (13165200).

Almost surely, 2^138659618 is an apocalyptic number.

138659618 is a deficient number, since it is larger than the sum of its proper divisors (71983582).

138659618 is a wasteful number, since it uses less digits than its factorization.

138659618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881.

The product of its digits is 311040, while the sum is 47.

The square root of 138659618 is about 11775.3818621733. The cubic root of 138659618 is about 517.5869681994.

The spelling of 138659618 in words is "one hundred thirty-eight million, six hundred fifty-nine thousand, six hundred eighteen".