199997868 has 48 divisors (see below), whose sum is σ = 534401280. Its totient is φ = 57027264.

The previous prime is 199997867. The next prime is 199997869. The reversal of 199997868 is 868799991.

It is an interprime number because it is at equal distance from previous prime (199997867) and next prime (199997869).

It is a junction number, because it is equal to n+sod(n) for n = 199997799 and 199997808.

It is not an unprimeable number, because it can be changed into a prime (199997867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45178 + ... + 49406.

It is an arithmetic number, because the mean of its divisors is an integer number (11133360).

Almost surely, 2^199997868 is an apocalyptic number.

It is an amenable number.

199997868 is an abundant number, since it is smaller than the sum of its proper divisors (334403412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199997868 is a wasteful number, since it uses less digits than its factorization.

199997868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806 (or 4804 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 66.

The square root of 199997868 is about 14142.0602459472. The cubic root of 199997868 is about 584.8014696333.

The spelling of 199997868 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, eight hundred sixty-eight".