195861138 has 32 divisors (see below), whose sum is σ = 428101632. Its totient is φ = 59245200.

The previous prime is 195861137. The next prime is 195861151. The reversal of 195861138 is 831168591.

195861138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 195861138.

It is not an unprimeable number, because it can be changed into a prime (195861137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39295 + ... + 43997.

It is an arithmetic number, because the mean of its divisors is an integer number (13378176).

Almost surely, 2^195861138 is an apocalyptic number.

195861138 is an abundant number, since it is smaller than the sum of its proper divisors (232240494).

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

195861138 is a wasteful number, since it uses less digits than its factorization.

195861138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350.

The product of its digits is 51840, while the sum is 42.

The square root of 195861138 is about 13995.0397641450. The cubic root of 195861138 is about 580.7413607423.

The spelling of 195861138 in words is "one hundred ninety-five million, eight hundred sixty-one thousand, one hundred thirty-eight".