138181794 has 16 divisors (see below), whose sum is σ = 290909280. Its totient is φ = 43636320.

The previous prime is 138181777. The next prime is 138181801. The reversal of 138181794 is 497181831.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605947 + ... + 606174.

It is an arithmetic number, because the mean of its divisors is an integer number (18181830).

Almost surely, 2^138181794 is an apocalyptic number.

138181794 is an abundant number, since it is smaller than the sum of its proper divisors (152727486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138181794 is a wasteful number, since it uses less digits than its factorization.

138181794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212145.

The product of its digits is 48384, while the sum is 42.

The square root of 138181794 is about 11755.0752443360. The cubic root of 138181794 is about 516.9917453821.

The spelling of 138181794 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, seven hundred ninety-four".