90198 has 12 divisors (see below), whose sum is σ = 195468. Its totient is φ = 30060.

The previous prime is 90197. The next prime is 90199. The reversal of 90198 is 89109.

It is an interprime number because it is at equal distance from previous prime (90197) and next prime (90199).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2488 + ... + 2523.

It is an arithmetic number, because the mean of its divisors is an integer number (16289).

2⁹⁰¹⁹⁸ is an apocalyptic number.

90198 is an abundant number, since it is smaller than the sum of its proper divisors (105270).

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

90198 is a wasteful number, since it uses less digits than its factorization.

90198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019 (or 5016 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 90198 is about 300.3298186994. The cubic root of 90198 is about 44.8468870298.

Subtracting from 90198 its reverse (89109), we obtain a square (1089 = 33²).

It can be divided in two parts, 901 and 98, that added together give a palindrome (999).

The spelling of 90198 in words is "ninety thousand, one hundred ninety-eight".