198689900 has 18 divisors (see below), whose sum is σ = 431157300. Its totient is φ = 79475920.

The previous prime is 198689899. The next prime is 198689903. The reversal of 198689900 is 9986891.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (198689903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 993350 + ... + 993549.

Almost surely, 2^198689900 is an apocalyptic number.

198689900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198689900 is an abundant number, since it is smaller than the sum of its proper divisors (232467400).

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

198689900 is a wasteful number, since it uses less digits than its factorization.

198689900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986913 (or 1986906 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 198689900 is about 14095.7404913683. The cubic root of 198689900 is about 583.5238307536.

The spelling of 198689900 in words is "one hundred ninety-eight million, six hundred eighty-nine thousand, nine hundred".