198436420 has 72 divisors (see below), whose sum is σ = 515761344. Its totient is φ = 62794368.

The previous prime is 198436391. The next prime is 198436423. The reversal of 198436420 is 24634891.

It is a self number, because there is not a number n which added to its sum of digits gives 198436420.

It is not an unprimeable number, because it can be changed into a prime (198436423) 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, 19467 + ... + 27853.

It is an arithmetic number, because the mean of its divisors is an integer number (7163352).

Almost surely, 2^198436420 is an apocalyptic number.

198436420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198436420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257880672).

198436420 is an abundant number, since it is smaller than the sum of its proper divisors (317324924).

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

198436420 is a wasteful number, since it uses less digits than its factorization.

198436420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8429 (or 8414 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 198436420 is about 14086.7462531274. The cubic root of 198436420 is about 583.2755803141.

The spelling of 198436420 in words is "one hundred ninety-eight million, four hundred thirty-six thousand, four hundred twenty".