198278144 has 44 divisors (see below), whose sum is σ = 398575464. Its totient is φ = 98586624.

The previous prime is 198278083. The next prime is 198278159. The reversal of 198278144 is 441872891.

It is a junction number, because it is equal to n+sod(n) for n = 198278095 and 198278104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232022 + ... + 232874.

Almost surely, 2^198278144 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 198278144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199287732).

198278144 is an abundant number, since it is smaller than the sum of its proper divisors (200297320).

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

198278144 is an equidigital number, since it uses as much as digits as its factorization.

198278144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1082 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 198278144 is about 14081.1272276050. The cubic root of 198278144 is about 583.1204624825.

The spelling of 198278144 in words is "one hundred ninety-eight million, two hundred seventy-eight thousand, one hundred forty-four".