195508138 has 24 divisors (see below), whose sum is σ = 359100000. Its totient is φ = 79378488.

The previous prime is 195508133. The next prime is 195508139. The reversal of 195508138 is 831805591.

It is a self number, because there is not a number n which added to its sum of digits gives 195508138.

It is not an unprimeable number, because it can be changed into a prime (195508133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50638 + ... + 54361.

It is an arithmetic number, because the mean of its divisors is an integer number (14962500).

Almost surely, 2^195508138 is an apocalyptic number.

195508138 is a deficient number, since it is larger than the sum of its proper divisors (163591862).

195508138 is a wasteful number, since it uses less digits than its factorization.

195508138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105034 (or 105027 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 195508138 is about 13982.4224653670. The cubic root of 195508138 is about 580.3922614027.

The spelling of 195508138 in words is "one hundred ninety-five million, five hundred eight thousand, one hundred thirty-eight".