198438660 has 288 divisors, whose sum is σ = 753392640. Its totient is φ = 42830208.

The previous prime is 198438631. The next prime is 198438697. The reversal of 198438660 is 66834891.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 646227 + ... + 646533.

Almost surely, 2^198438660 is an apocalyptic number.

198438660 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 198438660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376696320).

198438660 is an abundant number, since it is smaller than the sum of its proper divisors (554953980).

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

198438660 is a wasteful number, since it uses less digits than its factorization.

198438660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 198438660 is about 14086.8257602627. The cubic root of 198438660 is about 583.2777750261.

The spelling of 198438660 in words is "one hundred ninety-eight million, four hundred thirty-eight thousand, six hundred sixty".