195505590 has 96 divisors (see below), whose sum is σ = 549607680. Its totient is φ = 44377536.

The previous prime is 195505523. The next prime is 195505591. The reversal of 195505590 is 95505591.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195505591) 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 47 ways as a sum of consecutive naturals, for example, 262759 + ... + 263501.

It is an arithmetic number, because the mean of its divisors is an integer number (5725080).

Almost surely, 2^195505590 is an apocalyptic number.

195505590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 195505590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274803840).

195505590 is an abundant number, since it is smaller than the sum of its proper divisors (354102090).

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

195505590 is a wasteful number, since it uses less digits than its factorization.

195505590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 50625, while the sum is 39.

The square root of 195505590 is about 13982.3313506725. The cubic root of 195505590 is about 580.3897400312.

Subtracting from 195505590 its reverse (95505591), we obtain a palindrome (99999999).

The spelling of 195505590 in words is "one hundred ninety-five million, five hundred five thousand, five hundred ninety".