198690 has 32 divisors (see below), whose sum is σ = 492480. Its totient is φ = 51264.

The previous prime is 198689. The next prime is 198701. The reversal of 198690 is 96891.

It is a happy number.

198690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×198690² = 78955432200, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (15390).

2¹⁹⁸⁶⁹⁰ is an apocalyptic number.

198690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 198690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246240).

198690 is an abundant number, since it is smaller than the sum of its proper divisors (293790).

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

198690 is a wasteful number, since it uses less digits than its factorization.

198690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 198690 is about 445.7465647652. The cubic root of 198690 is about 58.3523928649.

It can be divided in two parts, 198 and 690, that added together give a palindrome (888).

The spelling of 198690 in words is "one hundred ninety-eight thousand, six hundred ninety".