195597820 has 24 divisors (see below), whose sum is σ = 448097328. Its totient is φ = 71126400.

The previous prime is 195597811. The next prime is 195597821. The reversal of 195597820 is 28795591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195597821) 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, 444321 + ... + 444760.

It is an arithmetic number, because the mean of its divisors is an integer number (18670722).

Almost surely, 2^195597820 is an apocalyptic number.

195597820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195597820 is an abundant number, since it is smaller than the sum of its proper divisors (252499508).

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

195597820 is a wasteful number, since it uses less digits than its factorization.

195597820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889101 (or 889099 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 195597820 is about 13985.6290527098. The cubic root of 195597820 is about 580.4809922053.

The spelling of 195597820 in words is "one hundred ninety-five million, five hundred ninety-seven thousand, eight hundred twenty".