198861860 has 24 divisors (see below), whose sum is σ = 424690560. Its totient is φ = 78196064.

The previous prime is 198861853. The next prime is 198861863. The reversal of 198861860 is 68168891.

198861860 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (198861863) by changing a digit.

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, 83084 + ... + 85443.

It is an arithmetic number, because the mean of its divisors is an integer number (17695440).

Almost surely, 2^198861860 is an apocalyptic number.

198861860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198861860 is an abundant number, since it is smaller than the sum of its proper divisors (225828700).

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

198861860 is a wasteful number, since it uses less digits than its factorization.

198861860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168595 (or 168593 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 198861860 is about 14101.8388871806. The cubic root of 198861860 is about 583.6921228577.

The spelling of 198861860 in words is "one hundred ninety-eight million, eight hundred sixty-one thousand, eight hundred sixty".