198191086 has 8 divisors (see below), whose sum is σ = 297491544. Its totient is φ = 99027240.

The previous prime is 198191051. The next prime is 198191087. The reversal of 198191086 is 680191891.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198191087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30445 + ... + 36376.

It is an arithmetic number, because the mean of its divisors is an integer number (37186443).

Almost surely, 2^198191086 is an apocalyptic number.

198191086 is a deficient number, since it is larger than the sum of its proper divisors (99300458).

198191086 is a wasteful number, since it uses less digits than its factorization.

198191086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68306.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 198191086 is about 14078.0355873964. The cubic root of 198191086 is about 583.0351064067.

The spelling of 198191086 in words is "one hundred ninety-eight million, one hundred ninety-one thousand, eighty-six".