195209840 has 80 divisors (see below), whose sum is σ = 520680960. Its totient is φ = 66673920.

The previous prime is 195209801. The next prime is 195209849. The reversal of 195209840 is 48902591.

195209840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 195209794 and 195209803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195209849) 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 15 ways as a sum of consecutive naturals, for example, 200555 + ... + 201525.

It is an arithmetic number, because the mean of its divisors is an integer number (6508512).

Almost surely, 2^195209840 is an apocalyptic number.

195209840 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 195209840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260340480).

195209840 is an abundant number, since it is smaller than the sum of its proper divisors (325471120).

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

195209840 is a wasteful number, since it uses less digits than its factorization.

195209840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 195209840 is about 13971.7515007962. The cubic root of 195209840 is about 580.0969318771.

The spelling of 195209840 in words is "one hundred ninety-five million, two hundred nine thousand, eight hundred forty".