198191616 has 80 divisors (see below), whose sum is σ = 603455424. Its totient is φ = 56623104.

The previous prime is 198191611. The next prime is 198191629. The reversal of 198191616 is 616191891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (198191611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1536 + ... + 19968.

Almost surely, 2^198191616 is an apocalyptic number.

198191616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198191616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301727712).

198191616 is an abundant number, since it is smaller than the sum of its proper divisors (405263808).

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

198191616 is an equidigital number, since it uses as much as digits as its factorization.

198191616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18461 (or 18445 counting only the distinct ones).

The product of its digits is 23328, while the sum is 42.

The square root of 198191616 is about 14078.0544110328. The cubic root of 198191616 is about 583.0356261212.

The spelling of 198191616 in words is "one hundred ninety-eight million, one hundred ninety-one thousand, six hundred sixteen".