138611999 has 8 divisors (see below), whose sum is σ = 146973168. Its totient is φ = 130273920.

The previous prime is 138611987. The next prime is 138612031. The reversal of 138611999 is 999116831.

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 138611999 - 2⁴ = 138611983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138611929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7484 + ... + 18254.

It is an arithmetic number, because the mean of its divisors is an integer number (18371646).

Almost surely, 2^138611999 is an apocalyptic number.

138611999 is a deficient number, since it is larger than the sum of its proper divisors (8361169).

138611999 is a wasteful number, since it uses less digits than its factorization.

138611999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11545.

The product of its digits is 104976, while the sum is 47.

The square root of 138611999 is about 11773.3597159010. The cubic root of 138611999 is about 517.5277108704.

The spelling of 138611999 in words is "one hundred thirty-eight million, six hundred eleven thousand, nine hundred ninety-nine".