198590820 has 24 divisors (see below), whose sum is σ = 556054464. Its totient is φ = 52957536.

The previous prime is 198590801. The next prime is 198590837. The reversal of 198590820 is 28095891.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1654864 + ... + 1654983.

It is an arithmetic number, because the mean of its divisors is an integer number (23168936).

Almost surely, 2^198590820 is an apocalyptic number.

198590820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198590820 is an abundant number, since it is smaller than the sum of its proper divisors (357463644).

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

198590820 is a wasteful number, since it uses less digits than its factorization.

198590820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309859 (or 3309857 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 198590820 is about 14092.2255162199. The cubic root of 198590820 is about 583.4268200281.

The spelling of 198590820 in words is "one hundred ninety-eight million, five hundred ninety thousand, eight hundred twenty".