198473209 has 4 divisors (see below), whose sum is σ = 216516240. Its totient is φ = 180430180.

The previous prime is 198473189. The next prime is 198473239. The reversal of 198473209 is 902374891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198473209 - 2⁷ = 198473081 is a prime.

It is a super-2 number, since 2×198473209² = 78783229381515362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198473239) 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, 9021499 + ... + 9021520.

It is an arithmetic number, because the mean of its divisors is an integer number (54129060).

Almost surely, 2^198473209 is an apocalyptic number.

It is an amenable number.

198473209 is a deficient number, since it is larger than the sum of its proper divisors (18043031).

198473209 is a wasteful number, since it uses less digits than its factorization.

198473209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18043030.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 198473209 is about 14088.0519945094. The cubic root of 198473209 is about 583.3116234279.

The spelling of 198473209 in words is "one hundred ninety-eight million, four hundred seventy-three thousand, two hundred nine".