198162409 has 4 divisors (see below), whose sum is σ = 199158400. Its totient is φ = 197166420.

The previous prime is 198162397. The next prime is 198162427. The reversal of 198162409 is 904261891.

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 198162409 - 2¹⁹ = 197638121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198162479) 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, 497697 + ... + 498094.

It is an arithmetic number, because the mean of its divisors is an integer number (49789600).

Almost surely, 2^198162409 is an apocalyptic number.

It is an amenable number.

198162409 is a deficient number, since it is larger than the sum of its proper divisors (995991).

198162409 is an equidigital number, since it uses as much as digits as its factorization.

198162409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995990.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 198162409 is about 14077.0170490768. The cubic root of 198162409 is about 583.0069845495.

The spelling of 198162409 in words is "one hundred ninety-eight million, one hundred sixty-two thousand, four hundred nine".