198456840 has 48 divisors (see below), whose sum is σ = 644985900. Its totient is φ = 52921728.

The previous prime is 198456821. The next prime is 198456871. The reversal of 198456840 is 48654891.

198456840 is a `hidden beast` number, since 1 + 9 + 84 + 568 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 190605636 + 7851204 = 13806^2 + 2802^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 11 ways as a sum of consecutive naturals, for example, 275275 + ... + 275994.

Almost surely, 2^198456840 is an apocalyptic number.

198456840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198456840 is an abundant number, since it is smaller than the sum of its proper divisors (446529060).

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

198456840 is a wasteful number, since it uses less digits than its factorization.

198456840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551286 (or 551279 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 198456840 is about 14087.4710292515. The cubic root of 198456840 is about 583.2955868546.

The spelling of 198456840 in words is "one hundred ninety-eight million, four hundred fifty-six thousand, eight hundred forty".