138108985 has 32 divisors (see below), whose sum is σ = 193536000. Its totient is φ = 92664000.

The previous prime is 138108959. The next prime is 138109019. The reversal of 138108985 is 589801831.

It is not a de Polignac number, because 138108985 - 2⁵ = 138108953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550110 + ... + 550360.

It is an arithmetic number, because the mean of its divisors is an integer number (6048000).

Almost surely, 2^138108985 is an apocalyptic number.

It is an amenable number.

138108985 is a deficient number, since it is larger than the sum of its proper divisors (55427015).

138108985 is a wasteful number, since it uses less digits than its factorization.

138108985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 138108985 is about 11751.9779186314. The cubic root of 138108985 is about 516.9009271828.

The spelling of 138108985 in words is "one hundred thirty-eight million, one hundred eight thousand, nine hundred eighty-five".