198291789 has 24 divisors (see below), whose sum is σ = 290463680. Its totient is φ = 130341312.

The previous prime is 198291773. The next prime is 198291799. The reversal of 198291789 is 987192891.

It is not a de Polignac number, because 198291789 - 2⁴ = 198291773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198291799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378882 + ... + 379404.

Almost surely, 2^198291789 is an apocalyptic number.

It is an amenable number.

198291789 is a deficient number, since it is larger than the sum of its proper divisors (92171891).

198291789 is a wasteful number, since it uses less digits than its factorization.

198291789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1038 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 198291789 is about 14081.6117330368. The cubic root of 198291789 is about 583.1338384671.

The spelling of 198291789 in words is "one hundred ninety-eight million, two hundred ninety-one thousand, seven hundred eighty-nine".