198521650 has 24 divisors (see below), whose sum is σ = 379233540. Its totient is φ = 77261760.

The previous prime is 198521629. The next prime is 198521651. The reversal of 198521650 is 56125891.

It can be written as a sum of positive squares in 6 ways, for example, as 80299521 + 118222129 = 8961^2 + 10873^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (198521651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51805 + ... + 55504.

Almost surely, 2^198521650 is an apocalyptic number.

198521650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198521650 is a deficient number, since it is larger than the sum of its proper divisors (180711890).

198521650 is a wasteful number, since it uses less digits than its factorization.

198521650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107358 (or 107353 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 198521650 is about 14089.7711124063. The cubic root of 198521650 is about 583.3590755080.

The spelling of 198521650 in words is "one hundred ninety-eight million, five hundred twenty-one thousand, six hundred fifty".