198901000 has 32 divisors (see below), whose sum is σ = 465430680. Its totient is φ = 79560000.

The previous prime is 198900979. The next prime is 198901009. The reversal of 198901000 is 109891.

It can be written as a sum of positive squares in 4 ways, for example, as 26399044 + 172501956 = 5138^2 + 13134^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 198901000.

It is not an unprimeable number, because it can be changed into a prime (198901009) 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, 98451 + ... + 100450.

Almost surely, 2^198901000 is an apocalyptic number.

198901000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198901000 is an abundant number, since it is smaller than the sum of its proper divisors (266529680).

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

198901000 is a wasteful number, since it uses less digits than its factorization.

198901000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198922 (or 198908 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 198901000 is about 14103.2265811764. The cubic root of 198901000 is about 583.7304144486.

The spelling of 198901000 in words is "one hundred ninety-eight million, nine hundred one thousand".