198401984 has 56 divisors (see below), whose sum is σ = 443398656. Its totient is φ = 87264000.

The previous prime is 198401981. The next prime is 198402007. The reversal of 198401984 is 489104891.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198401981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17279 + ... + 26369.

Almost surely, 2^198401984 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 198401984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221699328).

198401984 is an abundant number, since it is smaller than the sum of its proper divisors (244996672).

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

198401984 is a wasteful number, since it uses less digits than its factorization.

198401984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145 (or 9135 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 198401984 is about 14085.5239164186. The cubic root of 198401984 is about 583.2418384572.

The spelling of 198401984 in words is "one hundred ninety-eight million, four hundred one thousand, nine hundred eighty-four".