198890 has 8 divisors (see below), whose sum is σ = 358020. Its totient is φ = 79552.

The previous prime is 198859. The next prime is 198899. The reversal of 198890 is 98891.

It is a happy number.

198890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 190969 + 7921 = 437^2 + 89^2 .

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

It is a plaindrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 198890.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198899) 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, 9935 + ... + 9954.

2¹⁹⁸⁸⁹⁰ is an apocalyptic number.

198890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198890 is a deficient number, since it is larger than the sum of its proper divisors (159130).

198890 is a wasteful number, since it uses less digits than its factorization.

198890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19896.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 198890 is about 445.9708510654. The cubic root of 198890 is about 58.3719653395.

Subtracting from 198890 its reverse (98891), we obtain a palindrome (99999).

The spelling of 198890 in words is "one hundred ninety-eight thousand, eight hundred ninety".