198597820 has 12 divisors (see below), whose sum is σ = 417055464. Its totient is φ = 79439120.

The previous prime is 198597799. The next prime is 198597853. The reversal of 198597820 is 28795891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4964926 + ... + 4964965.

It is an arithmetic number, because the mean of its divisors is an integer number (34754622).

Almost surely, 2^198597820 is an apocalyptic number.

198597820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198597820 is an abundant number, since it is smaller than the sum of its proper divisors (218457644).

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

198597820 is a wasteful number, since it uses less digits than its factorization.

198597820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9929900 (or 9929898 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 198597820 is about 14092.4738779251. The cubic root of 198597820 is about 583.4336748930.

The spelling of 198597820 in words is "one hundred ninety-eight million, five hundred ninety-seven thousand, eight hundred twenty".