195138 has 24 divisors (see below), whose sum is σ = 435708. Its totient is φ = 63072.

The previous prime is 195137. The next prime is 195157. The reversal of 195138 is 831591.

195138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 45369 = 387^2 + 213^2 .

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (195131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 520 + ... + 812.

2¹⁹⁵¹³⁸ is an apocalyptic number.

195138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 195138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217854).

195138 is an abundant number, since it is smaller than the sum of its proper divisors (240570).

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

195138 is a wasteful number, since it uses less digits than its factorization.

195138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 335 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 195138 is about 441.7442699119. The cubic root of 195138 is about 58.0025761836.

It can be divided in two parts, 195 and 138, that added together give a palindrome (333).

The spelling of 195138 in words is "one hundred ninety-five thousand, one hundred thirty-eight".