138218899 has 16 divisors (see below), whose sum is σ = 174076672. Its totient is φ = 106813728.

The previous prime is 138218897. The next prime is 138218903. The reversal of 138218899 is 998812831.

It is not a de Polignac number, because 138218899 - 2¹ = 138218897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138218897) 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 15 ways as a sum of consecutive naturals, for example, 13749 + ... + 21574.

It is an arithmetic number, because the mean of its divisors is an integer number (10879792).

Almost surely, 2^138218899 is an apocalyptic number.

138218899 is a deficient number, since it is larger than the sum of its proper divisors (35857773).

138218899 is a wasteful number, since it uses less digits than its factorization.

138218899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35386.

The product of its digits is 248832, while the sum is 49.

The square root of 138218899 is about 11756.6533928665. The cubic root of 138218899 is about 517.0380159782.

The spelling of 138218899 in words is "one hundred thirty-eight million, two hundred eighteen thousand, eight hundred ninety-nine".