198059805 has 12 divisors (see below), whose sum is σ = 343303740. Its totient is φ = 105631872.

The previous prime is 198059801. The next prime is 198059861. The reversal of 198059805 is 508950891.

198059805 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in 2 ways, for example, as 119311929 + 78747876 = 10923^2 + 8874^2 .

It is not a de Polignac number, because 198059805 - 2² = 198059801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4401329 = 198059805 / (1 + 9 + 8 + 0 + 5 + 9 + 8 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198059801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2200620 + ... + 2200709.

It is an arithmetic number, because the mean of its divisors is an integer number (28608645).

Almost surely, 2^198059805 is an apocalyptic number.

198059805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198059805 is a deficient number, since it is larger than the sum of its proper divisors (145243935).

198059805 is a wasteful number, since it uses less digits than its factorization.

198059805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4401340 (or 4401337 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 198059805 is about 14073.3721971672. The cubic root of 198059805 is about 582.9063445809.

The spelling of 198059805 in words is "one hundred ninety-eight million, fifty-nine thousand, eight hundred five".