198404643 has 8 divisors (see below), whose sum is σ = 267012288. Its totient is φ = 131033384.

The previous prime is 198404561. The next prime is 198404651. The reversal of 198404643 is 346404891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198404643 - 2²⁰ = 197356067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198404653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308721 + ... + 309362.

It is an arithmetic number, because the mean of its divisors is an integer number (33376536).

Almost surely, 2^198404643 is an apocalyptic number.

198404643 is a deficient number, since it is larger than the sum of its proper divisors (68607645).

198404643 is a wasteful number, since it uses less digits than its factorization.

198404643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618193.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 198404643 is about 14085.6183037877. The cubic root of 198404643 is about 583.2444439975.

The spelling of 198404643 in words is "one hundred ninety-eight million, four hundred four thousand, six hundred forty-three".