198891693 has 120 divisors (see below), whose sum is σ = 403741184. Its totient is φ = 94944960.

The previous prime is 198891689. The next prime is 198891701. The reversal of 198891693 is 396198891.

It is not a de Polignac number, because 198891693 - 2² = 198891689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198891643) 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 119 ways as a sum of consecutive naturals, for example, 891780 + ... + 892002.

Almost surely, 2^198891693 is an apocalyptic number.

198891693 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

198891693 is an abundant number, since it is smaller than the sum of its proper divisors (204849491).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198891693 is a wasteful number, since it uses less digits than its factorization.

198891693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 257 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 198891693 is about 14102.8966173620. The cubic root of 198891693 is about 583.7213096449.

The spelling of 198891693 in words is "one hundred ninety-eight million, eight hundred ninety-one thousand, six hundred ninety-three".