198987843 has 8 divisors (see below), whose sum is σ = 265420800. Its totient is φ = 132606728.

The previous prime is 198987827. The next prime is 198987847. The reversal of 198987843 is 348789891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198987843 - 2⁴ = 198987827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198987847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2883 + ... + 20156.

It is an arithmetic number, because the mean of its divisors is an integer number (33177600).

Almost surely, 2^198987843 is an apocalyptic number.

198987843 is a deficient number, since it is larger than the sum of its proper divisors (66432957).

198987843 is a wasteful number, since it uses less digits than its factorization.

198987843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25921.

The product of its digits is 3483648, while the sum is 57.

The square root of 198987843 is about 14106.3050796444. The cubic root of 198987843 is about 583.8153570825.

The spelling of 198987843 in words is "one hundred ninety-eight million, nine hundred eighty-seven thousand, eight hundred forty-three".