198393409 has 4 divisors (see below), whose sum is σ = 199125760. Its totient is φ = 197661060.

The previous prime is 198393389. The next prime is 198393427. The reversal of 198393409 is 904393891.

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 198393409 - 2⁹ = 198392897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198393479) 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, 365769 + ... + 366310.

It is an arithmetic number, because the mean of its divisors is an integer number (49781440).

Almost surely, 2^198393409 is an apocalyptic number.

It is an amenable number.

198393409 is a deficient number, since it is larger than the sum of its proper divisors (732351).

198393409 is an equidigital number, since it uses as much as digits as its factorization.

198393409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732350.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 198393409 is about 14085.2195226060. The cubic root of 198393409 is about 583.2334357005.

The spelling of 198393409 in words is "one hundred ninety-eight million, three hundred ninety-three thousand, four hundred nine".