198391000 has 32 divisors (see below), whose sum is σ = 464237280. Its totient is φ = 79356000.

The previous prime is 198390991. The next prime is 198391007. The reversal of 198391000 is 193891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198391007) 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, 98196 + ... + 100195.

It is an arithmetic number, because the mean of its divisors is an integer number (14507415).

Almost surely, 2^198391000 is an apocalyptic number.

198391000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198391000 is an abundant number, since it is smaller than the sum of its proper divisors (265846280).

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

198391000 is a wasteful number, since it uses less digits than its factorization.

198391000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198412 (or 198398 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 198391000 is about 14085.1340071722. The cubic root of 198391000 is about 583.2310750457.

The spelling of 198391000 in words is "one hundred ninety-eight million, three hundred ninety-one thousand".