198993859 has 8 divisors (see below), whose sum is σ = 209598480. Its totient is φ = 188402400.

The previous prime is 198993841. The next prime is 198993913. The reversal of 198993859 is 958399891.

It is a happy number.

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 198993859 - 2¹¹ = 198991811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198993797 and 198993806.

It is not an unprimeable number, because it can be changed into a prime (198993059) 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 7 ways as a sum of consecutive naturals, for example, 50169 + ... + 53989.

It is an arithmetic number, because the mean of its divisors is an integer number (26199810).

Almost surely, 2^198993859 is an apocalyptic number.

198993859 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

198993859 is a deficient number, since it is larger than the sum of its proper divisors (10604621).

198993859 is a wasteful number, since it uses less digits than its factorization.

198993859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6581.

The product of its digits is 6298560, while the sum is 61.

The square root of 198993859 is about 14106.5183160126. The cubic root of 198993859 is about 583.8212405203.

The spelling of 198993859 in words is "one hundred ninety-eight million, nine hundred ninety-three thousand, eight hundred fifty-nine".