195591840 has 48 divisors (see below), whose sum is σ = 616115808. Its totient is φ = 52157696.

The previous prime is 195591733. The next prime is 195591841. The reversal of 195591840 is 48195591.

195591840 is digitally balanced in base 2, 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 (48).

It is a junction number, because it is equal to n+sod(n) for n = 195591792 and 195591801.

It is not an unprimeable number, because it can be changed into a prime (195591841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203262 + ... + 204221.

It is an arithmetic number, because the mean of its divisors is an integer number (12835746).

Almost surely, 2^195591840 is an apocalyptic number.

195591840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195591840 is an abundant number, since it is smaller than the sum of its proper divisors (420523968).

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

195591840 is a wasteful number, since it uses less digits than its factorization.

195591840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407501 (or 407493 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 195591840 is about 13985.4152601916. The cubic root of 195591840 is about 580.4750764753.

The spelling of 195591840 in words is "one hundred ninety-five million, five hundred ninety-one thousand, eight hundred forty".