138108986 has 16 divisors (see below), whose sum is σ = 230895360. Its totient is φ = 61571520.

The previous prime is 138108959. The next prime is 138109019. The reversal of 138108986 is 689801831.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106250 + ... + 107541.

It is an arithmetic number, because the mean of its divisors is an integer number (14430960).

Almost surely, 2^138108986 is an apocalyptic number.

138108986 is a deficient number, since it is larger than the sum of its proper divisors (92786374).

138108986 is a wasteful number, since it uses less digits than its factorization.

138108986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213829.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 138108986 is about 11751.9779611774. The cubic root of 138108986 is about 516.9009284303.

The spelling of 138108986 in words is "one hundred thirty-eight million, one hundred eight thousand, nine hundred eighty-six".