138611998 has 8 divisors (see below), whose sum is σ = 237620592. Its totient is φ = 59405136.

The previous prime is 138611987. The next prime is 138612031. The reversal of 138611998 is 899116831.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4950415 + ... + 4950442.

It is an arithmetic number, because the mean of its divisors is an integer number (29702574).

Almost surely, 2^138611998 is an apocalyptic number.

138611998 is a deficient number, since it is larger than the sum of its proper divisors (99008594).

138611998 is an equidigital number, since it uses as much as digits as its factorization.

138611998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9900866.

The product of its digits is 93312, while the sum is 46.

The square root of 138611998 is about 11773.3596734322. The cubic root of 138611998 is about 517.5277096258.

The spelling of 138611998 in words is "one hundred thirty-eight million, six hundred eleven thousand, nine hundred ninety-eight".