198634047 has 4 divisors (see below), whose sum is σ = 264845400. Its totient is φ = 132422696.

The previous prime is 198634013. The next prime is 198634067. The reversal of 198634047 is 740436891.

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 198634047 - 2¹¹ = 198631999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198634067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33105672 + ... + 33105677.

It is an arithmetic number, because the mean of its divisors is an integer number (66211350).

Almost surely, 2^198634047 is an apocalyptic number.

198634047 is a deficient number, since it is larger than the sum of its proper divisors (66211353).

198634047 is an equidigital number, since it uses as much as digits as its factorization.

198634047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66211352.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 198634047 is about 14093.7591507731. The cubic root of 198634047 is about 583.4691482040.

The spelling of 198634047 in words is "one hundred ninety-eight million, six hundred thirty-four thousand, forty-seven".