195859988 has 6 divisors (see below), whose sum is σ = 342754986. Its totient is φ = 97929992.

The previous prime is 195859987. The next prime is 195860003. The reversal of 195859988 is 889958591.

It can be written as a sum of positive squares in only one way, i.e., 195216784 + 643204 = 13972^2 + 802^2 .

It is a super-2 number, since 2×195859988² = 76722269798720288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 195859988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195859987) 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 as a sum of consecutive naturals, namely, 24482495 + ... + 24482502.

It is an arithmetic number, because the mean of its divisors is an integer number (57125831).

Almost surely, 2^195859988 is an apocalyptic number.

It is an amenable number.

195859988 is a deficient number, since it is larger than the sum of its proper divisors (146894998).

195859988 is a wasteful number, since it uses less digits than its factorization.

195859988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48965001 (or 48964999 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 62.

The square root of 195859988 is about 13994.9986780993. The cubic root of 195859988 is about 580.7402241311.

The spelling of 195859988 in words is "one hundred ninety-five million, eight hundred fifty-nine thousand, nine hundred eighty-eight".