198198890 has 8 divisors (see below), whose sum is σ = 356758020. Its totient is φ = 79279552.

The previous prime is 198198881. The next prime is 198198901. The reversal of 198198890 is 98891891.

It can be written as a sum of positive squares in 2 ways, for example, as 191075329 + 7123561 = 13823^2 + 2669^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9909935 + ... + 9909954.

Almost surely, 2^198198890 is an apocalyptic number.

198198890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198198890 is a deficient number, since it is larger than the sum of its proper divisors (158559130).

198198890 is a wasteful number, since it uses less digits than its factorization.

198198890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19819896.

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 198198890 is about 14078.3127540199. The cubic root of 198198890 is about 583.0427588636.

The spelling of 198198890 in words is "one hundred ninety-eight million, one hundred ninety-eight thousand, eight hundred ninety".