138617999 has 8 divisors (see below), whose sum is σ = 154428960. Its totient is φ = 123542496.

The previous prime is 138617989. The next prime is 138618023. The reversal of 138617999 is 999716831.

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

It is a cyclic number.

It is not a de Polignac number, because 138617999 - 2²⁴ = 121840783 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 138617999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138617909) 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, 183467 + ... + 184220.

It is an arithmetic number, because the mean of its divisors is an integer number (19303620).

Almost surely, 2^138617999 is an apocalyptic number.

138617999 is a deficient number, since it is larger than the sum of its proper divisors (15810961).

138617999 is a wasteful number, since it uses less digits than its factorization.

138617999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367729.

The product of its digits is 734832, while the sum is 53.

The square root of 138617999 is about 11773.6145257096. The cubic root of 138617999 is about 517.5351780485.

The spelling of 138617999 in words is "one hundred thirty-eight million, six hundred seventeen thousand, nine hundred ninety-nine".