138642099 has 8 divisors (see below), whose sum is σ = 185795280. Its totient is φ = 91958496.

The previous prime is 138642079. The next prime is 138642103. The reversal of 138642099 is 990246831.

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

It is not a de Polignac number, because 138642099 - 2⁵ = 138642067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138642099.

It is not an unprimeable number, because it can be changed into a prime (138642059) 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, 116704 + ... + 117885.

It is an arithmetic number, because the mean of its divisors is an integer number (23224410).

Almost surely, 2^138642099 is an apocalyptic number.

138642099 is a deficient number, since it is larger than the sum of its proper divisors (47153181).

138642099 is a wasteful number, since it uses less digits than its factorization.

138642099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234789.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 138642099 is about 11774.6379562176. The cubic root of 138642099 is about 517.5651690432.

The spelling of 138642099 in words is "one hundred thirty-eight million, six hundred forty-two thousand, ninety-nine".