185138 has 4 divisors (see below), whose sum is σ = 277710. Its totient is φ = 92568.

The previous prime is 185137. The next prime is 185149. The reversal of 185138 is 831581.

185138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831581 = 97 ⋅8573.

It can be written as a sum of positive squares in only one way, i.e., 182329 + 2809 = 427^2 + 53^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 185138.

It is not an unprimeable number, because it can be changed into a prime (185131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46283 + ... + 46286.

2¹⁸⁵¹³⁸ is an apocalyptic number.

185138 is a deficient number, since it is larger than the sum of its proper divisors (92572).

185138 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 185138 = (311858)₉.

185138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92571.

The product of its digits is 960, while the sum is 26.

The square root of 185138 is about 430.2766551883. The cubic root of 185138 is about 56.9943566794.

It can be divided in two parts, 185 and 138, that added together give a palindrome (323).

The spelling of 185138 in words is "one hundred eighty-five thousand, one hundred thirty-eight".