198381 has 8 divisors (see below), whose sum is σ = 267840. Its totient is φ = 130592.

The previous prime is 198377. The next prime is 198391. The reversal of 198381 is 183891.

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 198381 - 2² = 198377 is a prime.

It is a super-2 number, since 2×198381² = 78710042322, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198381.

It is not an unprimeable number, because it can be changed into a prime (198301) 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, 105 + ... + 638.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2¹⁹⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

198381 is a deficient number, since it is larger than the sum of its proper divisors (69459).

198381 is an equidigital number, since it uses as much as digits as its factorization.

198381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835.

The product of its digits is 1728, while the sum is 30.

The square root of 198381 is about 445.3998203861. The cubic root of 198381 is about 58.3221275527.

The spelling of 198381 in words is "one hundred ninety-eight thousand, three hundred eighty-one".