199997847 has 24 divisors (see below), whose sum is σ = 330545280. Its totient is φ = 114149520.

The previous prime is 199997797. The next prime is 199997851. The reversal of 199997847 is 748799991.

It is not a de Polignac number, because 199997847 - 2¹⁶ = 199932311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199997867) 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 23 ways as a sum of consecutive naturals, for example, 80104 + ... + 82562.

It is an arithmetic number, because the mean of its divisors is an integer number (13772720).

Almost surely, 2^199997847 is an apocalyptic number.

199997847 is a deficient number, since it is larger than the sum of its proper divisors (130547433).

199997847 is a wasteful number, since it uses less digits than its factorization.

199997847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763 (or 3760 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The square root of 199997847 is about 14142.0595034811. The cubic root of 199997847 is about 584.8014491650.

The spelling of 199997847 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, eight hundred forty-seven".