185238139 has 8 divisors (see below), whose sum is σ = 189370368. Its totient is φ = 181113960.

The previous prime is 185238121. The next prime is 185238149. The reversal of 185238139 is 931832581.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185238139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185238149) 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, 86694 + ... + 88804.

It is an arithmetic number, because the mean of its divisors is an integer number (23671296).

Almost surely, 2^185238139 is an apocalyptic number.

185238139 is a deficient number, since it is larger than the sum of its proper divisors (4132229).

185238139 is a wasteful number, since it uses less digits than its factorization.

185238139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025.

The product of its digits is 51840, while the sum is 40.

The square root of 185238139 is about 13610.2218571190. The cubic root of 185238139 is about 570.0463068976.

It can be divided in two parts, 18523 and 8139, that added together give a palindrome (26662).

The spelling of 185238139 in words is "one hundred eighty-five million, two hundred thirty-eight thousand, one hundred thirty-nine".