198447999 has 4 divisors (see below), whose sum is σ = 264597336. Its totient is φ = 132298664.

The previous prime is 198447973. The next prime is 198448007. The reversal of 198447999 is 999744891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198447999 - 2¹⁶ = 198382463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198447299) 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 3 ways as a sum of consecutive naturals, for example, 33074664 + ... + 33074669.

It is an arithmetic number, because the mean of its divisors is an integer number (66149334).

Almost surely, 2^198447999 is an apocalyptic number.

198447999 is a deficient number, since it is larger than the sum of its proper divisors (66149337).

198447999 is an equidigital number, since it uses as much as digits as its factorization.

198447999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66149336.

The product of its digits is 5878656, while the sum is 60.

The square root of 198447999 is about 14087.1572362915. The cubic root of 198447999 is about 583.2869250336.

The spelling of 198447999 in words is "one hundred ninety-eight million, four hundred forty-seven thousand, nine hundred ninety-nine".