138184091 has 8 divisors (see below), whose sum is σ = 141826464. Its totient is φ = 134580160.

The previous prime is 138184087. The next prime is 138184099. The reversal of 138184091 is 190481831.

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

It is a cyclic number.

It is not a de Polignac number, because 138184091 - 2² = 138184087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138184099) by changing a digit.

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, 2255 + ... + 16776.

It is an arithmetic number, because the mean of its divisors is an integer number (17728308).

Almost surely, 2^138184091 is an apocalyptic number.

138184091 is a deficient number, since it is larger than the sum of its proper divisors (3642373).

138184091 is a wasteful number, since it uses less digits than its factorization.

138184091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19221.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 138184091 is about 11755.1729464096. The cubic root of 138184091 is about 516.9946100225.

The spelling of 138184091 in words is "one hundred thirty-eight million, one hundred eighty-four thousand, ninety-one".