198887961 has 8 divisors (see below), whose sum is σ = 265265280. Its totient is φ = 132551312.

The previous prime is 198887957. The next prime is 198887977. The reversal of 198887961 is 169788891.

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 198887961 - 2² = 198887957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198887911) 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, 4111 + ... + 20363.

It is an arithmetic number, because the mean of its divisors is an integer number (33158160).

Almost surely, 2^198887961 is an apocalyptic number.

It is an amenable number.

198887961 is a deficient number, since it is larger than the sum of its proper divisors (66377319).

198887961 is a wasteful number, since it uses less digits than its factorization.

198887961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20335.

The product of its digits is 1741824, while the sum is 57.

The square root of 198887961 is about 14102.7643034974. The cubic root of 198887961 is about 583.7176586435.

The spelling of 198887961 in words is "one hundred ninety-eight million, eight hundred eighty-seven thousand, nine hundred sixty-one".