195809994 has 64 divisors (see below), whose sum is σ = 466433280. Its totient is φ = 60730560.

The previous prime is 195809947. The next prime is 195810011. The reversal of 195809994 is 499908591.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 195809994.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43824 + ... + 48084.

It is an arithmetic number, because the mean of its divisors is an integer number (7288020).

Almost surely, 2^195809994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 195809994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233216640).

195809994 is an abundant number, since it is smaller than the sum of its proper divisors (270623286).

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

195809994 is a wasteful number, since it uses less digits than its factorization.

195809994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332 (or 4326 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 195809994 is about 13993.2124260300. The cubic root of 195809994 is about 580.6908078828.

The spelling of 195809994 in words is "one hundred ninety-five million, eight hundred nine thousand, nine hundred ninety-four".