195643788 has 24 divisors (see below), whose sum is σ = 457137408. Its totient is φ = 65123856.

The previous prime is 195643787. The next prime is 195643813. The reversal of 195643788 is 887346591.

It is a self number, because there is not a number n which added to its sum of digits gives 195643788.

It is not an unprimeable number, because it can be changed into a prime (195643787) 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 in 7 ways as a sum of consecutive naturals, for example, 2056 + ... + 19887.

It is an arithmetic number, because the mean of its divisors is an integer number (19047392).

Almost surely, 2^195643788 is an apocalyptic number.

It is an amenable number.

195643788 is an abundant number, since it is smaller than the sum of its proper divisors (261493620).

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

195643788 is a wasteful number, since it uses less digits than its factorization.

195643788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22693 (or 22691 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 195643788 is about 13987.2723573969. The cubic root of 195643788 is about 580.5264621398.

The spelling of 195643788 in words is "one hundred ninety-five million, six hundred forty-three thousand, seven hundred eighty-eight".