198444646 has 4 divisors (see below), whose sum is σ = 297666972. Its totient is φ = 99222322.

The previous prime is 198444643. The next prime is 198444647. The reversal of 198444646 is 646444891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646444891 = 31 ⋅20853061.

It is a junction number, because it is equal to n+sod(n) for n = 198444596 and 198444605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198444643) by changing a digit.

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 as a sum of consecutive naturals, namely, 49611160 + ... + 49611163.

It is an arithmetic number, because the mean of its divisors is an integer number (74416743).

Almost surely, 2^198444646 is an apocalyptic number.

198444646 is a deficient number, since it is larger than the sum of its proper divisors (99222326).

198444646 is an equidigital number, since it uses as much as digits as its factorization.

198444646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99222325.

The product of its digits is 663552, while the sum is 46.

The square root of 198444646 is about 14087.0382266820. The cubic root of 198444646 is about 583.2836399210.

The spelling of 198444646 in words is "one hundred ninety-eight million, four hundred forty-four thousand, six hundred forty-six".