198185856 has 64 divisors (see below), whose sum is σ = 574300800. Its totient is φ = 60055040.

The previous prime is 198185851. The next prime is 198185857. The reversal of 198185856 is 658581891.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 198185799 and 198185808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198185851) 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, 19236 + ... + 27683.

It is an arithmetic number, because the mean of its divisors is an integer number (8973450).

Almost surely, 2^198185856 is an apocalyptic number.

198185856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

198185856 is an abundant number, since it is smaller than the sum of its proper divisors (376114944).

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

198185856 is a wasteful number, since it uses less digits than its factorization.

198185856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46947 (or 46935 counting only the distinct ones).

The product of its digits is 691200, while the sum is 51.

The square root of 198185856 is about 14077.8498358237. The cubic root of 198185856 is about 583.0299778537.

The spelling of 198185856 in words is "one hundred ninety-eight million, one hundred eighty-five thousand, eight hundred fifty-six".