198900305 has 4 divisors (see below), whose sum is σ = 238680372. Its totient is φ = 159120240.

The previous prime is 198900293. The next prime is 198900353. The reversal of 198900305 is 503009891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503009891 = 5227 ⋅96233.

It can be written as a sum of positive squares in 2 ways, for example, as 127396369 + 71503936 = 11287^2 + 8456^2 .

It is not a de Polignac number, because 198900305 - 2²⁴ = 182123089 is a prime.

It is a super-2 number, since 2×198900305² = 79122662658186050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19890026 + ... + 19890035.

It is an arithmetic number, because the mean of its divisors is an integer number (59670093).

Almost surely, 2^198900305 is an apocalyptic number.

It is an amenable number.

198900305 is a deficient number, since it is larger than the sum of its proper divisors (39780067).

198900305 is an equidigital number, since it uses as much as digits as its factorization.

198900305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39780066.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 198900305 is about 14103.2019414032. The cubic root of 198900305 is about 583.7297345575.

The spelling of 198900305 in words is "one hundred ninety-eight million, nine hundred thousand, three hundred five".