198494605 has 4 divisors (see below), whose sum is σ = 238193532. Its totient is φ = 158795680.

The previous prime is 198494591. The next prime is 198494609. The reversal of 198494605 is 506494891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135815716 + 62678889 = 11654^2 + 7917^2 .

It is not a de Polignac number, because 198494605 - 2⁵ = 198494573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198494609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19849456 + ... + 19849465.

It is an arithmetic number, because the mean of its divisors is an integer number (59548383).

Almost surely, 2^198494605 is an apocalyptic number.

It is an amenable number.

198494605 is a deficient number, since it is larger than the sum of its proper divisors (39698927).

198494605 is an equidigital number, since it uses as much as digits as its factorization.

198494605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39698926.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 198494605 is about 14088.8113409187. The cubic root of 198494605 is about 583.3325835818.

The spelling of 198494605 in words is "one hundred ninety-eight million, four hundred ninety-four thousand, six hundred five".