198216865 has 32 divisors (see below), whose sum is σ = 300174336. Its totient is φ = 122055360.

The previous prime is 198216857. The next prime is 198216871. The reversal of 198216865 is 568612891.

It is not a de Polignac number, because 198216865 - 2³ = 198216857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28854 + ... + 35056.

It is an arithmetic number, because the mean of its divisors is an integer number (9380448).

Almost surely, 2^198216865 is an apocalyptic number.

It is an amenable number.

198216865 is a deficient number, since it is larger than the sum of its proper divisors (101957471).

198216865 is a wasteful number, since it uses less digits than its factorization.

198216865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309.

The product of its digits is 207360, while the sum is 46.

The square root of 198216865 is about 14078.9511328082. The cubic root of 198216865 is about 583.0603840494.

The spelling of 198216865 in words is "one hundred ninety-eight million, two hundred sixteen thousand, eight hundred sixty-five".