195188840 has 128 divisors (see below), whose sum is σ = 552960000. Its totient is φ = 60238080.

The previous prime is 195188839. The next prime is 195188857. The reversal of 195188840 is 48881591.

It is a Cunningham number, because it is equal to 13971²-1.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 195188791 and 195188800.

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, 390911 + ... + 391409.

It is an arithmetic number, because the mean of its divisors is an integer number (4320000).

Almost surely, 2^195188840 is an apocalyptic number.

195188840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 195188840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276480000).

195188840 is an abundant number, since it is smaller than the sum of its proper divisors (357771160).

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

195188840 is a wasteful number, since it uses less digits than its factorization.

195188840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 195188840 is about 13970.9999642116. Note that the first 4 decimals coincide. The cubic root of 195188840 is about 580.0761295234.

The spelling of 195188840 in words is "one hundred ninety-five million, one hundred eighty-eight thousand, eight hundred forty".