198814817 has 4 divisors (see below), whose sum is σ = 200380416. Its totient is φ = 197249220.

The previous prime is 198814793. The next prime is 198814831. The reversal of 198814817 is 718418891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198814817 - 2¹⁴ = 198798433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198814867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782609 + ... + 782862.

It is an arithmetic number, because the mean of its divisors is an integer number (50095104).

Almost surely, 2^198814817 is an apocalyptic number.

It is an amenable number.

198814817 is a deficient number, since it is larger than the sum of its proper divisors (1565599).

198814817 is a wasteful number, since it uses less digits than its factorization.

198814817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565598.

The product of its digits is 129024, while the sum is 47.

The square root of 198814817 is about 14100.1708145682. The cubic root of 198814817 is about 583.6460929251.

The spelling of 198814817 in words is "one hundred ninety-eight million, eight hundred fourteen thousand, eight hundred seventeen".