198428 has 12 divisors (see below), whose sum is σ = 351120. Its totient is φ = 98112.

The previous prime is 198427. The next prime is 198437. The reversal of 198428 is 824891.

It is a happy number.

It is an Ulam number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 198394 and 198403.

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 198428.

It is not an unprimeable number, because it can be changed into a prime (198427) 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, 233 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (29260).

2¹⁹⁸⁴²⁸ is an apocalyptic number.

It is an amenable number.

198428 is a deficient number, since it is larger than the sum of its proper divisors (152692).

198428 is a wasteful number, since it uses less digits than its factorization.

198428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 554 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 198428 is about 445.4525788454. The cubic root of 198428 is about 58.3267330401.

It can be divided in two parts, 198 and 428, that added together give a palindrome (626).

The spelling of 198428 in words is "one hundred ninety-eight thousand, four hundred twenty-eight".