198432643 has 12 divisors (see below), whose sum is σ = 206962624. Its totient is φ = 190054800.

The previous prime is 198432631. The next prime is 198432649. The reversal of 198432643 is 346234891.

It is a happy number.

It is not a de Polignac number, because 198432643 - 2⁹ = 198432131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198432596 and 198432605.

It is not an unprimeable number, because it can be changed into a prime (198432649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 531805 + ... + 532177.

Almost surely, 2^198432643 is an apocalyptic number.

198432643 is a deficient number, since it is larger than the sum of its proper divisors (8529981).

198432643 is an equidigital number, since it uses as much as digits as its factorization.

198432643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 535 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 198432643 is about 14086.6121903032. The cubic root of 198432643 is about 583.2718796395.

The spelling of 198432643 in words is "one hundred ninety-eight million, four hundred thirty-two thousand, six hundred forty-three".