198861 has 8 divisors (see below), whose sum is σ = 285600. Its totient is φ = 122352.

The previous prime is 198859. The next prime is 198899. The reversal of 198861 is 168891.

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

It is not a de Polignac number, because 198861 - 2¹ = 198859 is a prime.

It is an Ulam number.

198861 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

198861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198811) 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, 2511 + ... + 2588.

It is an arithmetic number, because the mean of its divisors is an integer number (35700).

2¹⁹⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

198861 is a deficient number, since it is larger than the sum of its proper divisors (86739).

198861 is a wasteful number, since it uses less digits than its factorization.

198861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115.

The product of its digits is 3456, while the sum is 33.

The square root of 198861 is about 445.9383365444. The cubic root of 198861 is about 58.3691281443.

The spelling of 198861 in words is "one hundred ninety-eight thousand, eight hundred sixty-one".