138166985 has 8 divisors (see below), whose sum is σ = 180873216. Its totient is φ = 100485040.

The previous prime is 138166979. The next prime is 138166997. The reversal of 138166985 is 589661831.

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

It is not a de Polignac number, because 138166985 - 2¹⁸ = 137904841 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 1256009 + ... + 1256118.

It is an arithmetic number, because the mean of its divisors is an integer number (22609152).

Almost surely, 2^138166985 is an apocalyptic number.

It is an amenable number.

138166985 is a deficient number, since it is larger than the sum of its proper divisors (42706231).

138166985 is a wasteful number, since it uses less digits than its factorization.

138166985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512143.

The product of its digits is 311040, while the sum is 47.

The square root of 138166985 is about 11754.4453293212. The cubic root of 138166985 is about 516.9732759826.

The spelling of 138166985 in words is "one hundred thirty-eight million, one hundred sixty-six thousand, nine hundred eighty-five".