198995409 has 12 divisors (see below), whose sum is σ = 287652352. Its totient is φ = 132564600.

The previous prime is 198995389. The next prime is 198995431. The reversal of 198995409 is 904599891.

198995409 is a `hidden beast` number, since 1 + 9 + 8 + 99 + 540 + 9 = 666.

It is not a de Polignac number, because 198995409 - 2¹⁵ = 198962641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198995449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5724 + ... + 20754.

Almost surely, 2^198995409 is an apocalyptic number.

It is an amenable number.

198995409 is a deficient number, since it is larger than the sum of its proper divisors (88656943).

198995409 is a wasteful number, since it uses less digits than its factorization.

198995409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16508 (or 16505 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 198995409 is about 14106.5732550467. The cubic root of 198995409 is about 583.8227563469.

The spelling of 198995409 in words is "one hundred ninety-eight million, nine hundred ninety-five thousand, four hundred nine".