195909540 has 24 divisors (see below), whose sum is σ = 548546880. Its totient is φ = 52242528.

The previous prime is 195909533. The next prime is 195909601. The reversal of 195909540 is 45909591.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 195909492 and 195909501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632520 + ... + 1632639.

It is an arithmetic number, because the mean of its divisors is an integer number (22856120).

Almost surely, 2^195909540 is an apocalyptic number.

195909540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195909540 is an abundant number, since it is smaller than the sum of its proper divisors (352637340).

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

195909540 is a wasteful number, since it uses less digits than its factorization.

195909540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265171 (or 3265169 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 195909540 is about 13996.7689128599. The cubic root of 195909540 is about 580.7891951902.

The spelling of 195909540 in words is "one hundred ninety-five million, nine hundred nine thousand, five hundred forty".