198399828 has 72 divisors (see below), whose sum is σ = 514001376. Its totient is φ = 59512640.

The previous prime is 198399827. The next prime is 198399847. The reversal of 198399828 is 828993891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198399821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154726 + ... + 156002.

It is an arithmetic number, because the mean of its divisors is an integer number (7138908).

Almost surely, 2^198399828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198399828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257000688).

198399828 is an abundant number, since it is smaller than the sum of its proper divisors (315601548).

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

198399828 is a wasteful number, since it uses less digits than its factorization.

198399828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1400 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 57.

The square root of 198399828 is about 14085.4473837362. The cubic root of 198399828 is about 583.2397257868.

The spelling of 198399828 in words is "one hundred ninety-eight million, three hundred ninety-nine thousand, eight hundred twenty-eight".