138189599 has 4 divisors (see below), whose sum is σ = 142647360. Its totient is φ = 133731840.

The previous prime is 138189581. The next prime is 138189619. The reversal of 138189599 is 995981831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138189599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138189599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138189509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2228834 + ... + 2228895.

It is an arithmetic number, because the mean of its divisors is an integer number (35661840).

Almost surely, 2^138189599 is an apocalyptic number.

138189599 is a deficient number, since it is larger than the sum of its proper divisors (4457761).

138189599 is an equidigital number, since it uses as much as digits as its factorization.

138189599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457760.

The product of its digits is 699840, while the sum is 53.

The square root of 138189599 is about 11755.4072239119. The cubic root of 138189599 is about 517.0014790440.

The spelling of 138189599 in words is "one hundred thirty-eight million, one hundred eighty-nine thousand, five hundred ninety-nine".