198644238 has 96 divisors (see below), whose sum is σ = 501935616. Its totient is φ = 58421088.

The previous prime is 198644233. The next prime is 198644279. The reversal of 198644238 is 832446891.

It is a happy number.

198644238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 198644193 and 198644202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198644233) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144631 + ... + 145997.

It is an arithmetic number, because the mean of its divisors is an integer number (5228496).

Almost surely, 2^198644238 is an apocalyptic number.

198644238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 198644238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250967808).

198644238 is an abundant number, since it is smaller than the sum of its proper divisors (303291378).

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

198644238 is a wasteful number, since it uses less digits than its factorization.

198644238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420 (or 1408 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 198644238 is about 14094.1206891384. The cubic root of 198644238 is about 583.4791264068.

The spelling of 198644238 in words is "one hundred ninety-eight million, six hundred forty-four thousand, two hundred thirty-eight".