195019840 has 28 divisors (see below), whose sum is σ = 464391756. Its totient is φ = 78007808.

The previous prime is 195019837. The next prime is 195019861. The reversal of 195019840 is 48910591.

195019840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 90326016 + 104693824 = 9504^2 + 10232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 195019840.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 304399 + ... + 305038.

Almost surely, 2^195019840 is an apocalyptic number.

195019840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195019840 is an abundant number, since it is smaller than the sum of its proper divisors (269371916).

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

195019840 is an equidigital number, since it uses as much as digits as its factorization.

195019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609454 (or 609444 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 195019840 is about 13964.9504116556. The cubic root of 195019840 is about 579.9086657608.

The spelling of 195019840 in words is "one hundred ninety-five million, nineteen thousand, eight hundred forty".