198404217 has 12 divisors (see below), whose sum is σ = 312637104. Its totient is φ = 120244920.

The previous prime is 198404191. The next prime is 198404221. The reversal of 198404217 is 712404891.

198404217 is a `hidden beast` number, since 198 + 40 + 421 + 7 = 666.

It is not a de Polignac number, because 198404217 - 2⁶ = 198404153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198404267) 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, 1001943 + ... + 1002140.

It is an arithmetic number, because the mean of its divisors is an integer number (26053092).

Almost surely, 2^198404217 is an apocalyptic number.

It is an amenable number.

198404217 is a deficient number, since it is larger than the sum of its proper divisors (114232887).

198404217 is a wasteful number, since it uses less digits than its factorization.

198404217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004100 (or 2004097 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 198404217 is about 14085.6031819727. The cubic root of 198404217 is about 583.2440265639.

The spelling of 198404217 in words is "one hundred ninety-eight million, four hundred four thousand, two hundred seventeen".