198943040 has 28 divisors (see below), whose sum is σ = 473733876. Its totient is φ = 79577088.

The previous prime is 198943013. The next prime is 198943127. The reversal of 198943040 is 40349891.

It can be written as a sum of positive squares in 2 ways, for example, as 21307456 + 177635584 = 4616^2 + 13328^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 198942985 and 198943003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310529 + ... + 311168.

It is an arithmetic number, because the mean of its divisors is an integer number (16919067).

Almost surely, 2^198943040 is an apocalyptic number.

198943040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198943040 is an abundant number, since it is smaller than the sum of its proper divisors (274790836).

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

198943040 is an equidigital number, since it uses as much as digits as its factorization.

198943040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621714 (or 621704 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 198943040 is about 14104.7169415058. The cubic root of 198943040 is about 583.7715375834.

The spelling of 198943040 in words is "one hundred ninety-eight million, nine hundred forty-three thousand, forty".