198865650 has 24 divisors (see below), whose sum is σ = 493187184. Its totient is φ = 53030800.

The previous prime is 198865633. The next prime is 198865657. The reversal of 198865650 is 56568891.

It is a self number, because there is not a number n which added to its sum of digits gives 198865650.

It is not an unprimeable number, because it can be changed into a prime (198865657) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 662736 + ... + 663035.

It is an arithmetic number, because the mean of its divisors is an integer number (20549466).

Almost surely, 2^198865650 is an apocalyptic number.

198865650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198865650 is an abundant number, since it is smaller than the sum of its proper divisors (294321534).

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

198865650 is a wasteful number, since it uses less digits than its factorization.

198865650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325786 (or 1325781 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 198865650 is about 14101.9732661780. The cubic root of 198865650 is about 583.6958309243.

The spelling of 198865650 in words is "one hundred ninety-eight million, eight hundred sixty-five thousand, six hundred fifty".