138323187 has 16 divisors (see below), whose sum is σ = 206741280. Its totient is φ = 91397376.

The previous prime is 138323183. The next prime is 138323197. The reversal of 138323187 is 781323831.

It is not a de Polignac number, because 138323187 - 2² = 138323183 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138323183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19618 + ... + 25719.

It is an arithmetic number, because the mean of its divisors is an integer number (12921330).

Almost surely, 2^138323187 is an apocalyptic number.

138323187 is a deficient number, since it is larger than the sum of its proper divisors (68418093).

138323187 is a wasteful number, since it uses less digits than its factorization.

138323187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45459 (or 45453 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 138323187 is about 11761.0878323393. The cubic root of 138323187 is about 517.1680206432.

The spelling of 138323187 in words is "one hundred thirty-eight million, three hundred twenty-three thousand, one hundred eighty-seven".