198831307 has 4 divisors (see below), whose sum is σ = 198994320. Its totient is φ = 198668296.

The previous prime is 198831301. The next prime is 198831323. The reversal of 198831307 is 703138891.

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 198831307 - 2¹⁹ = 198307019 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198831307.

It is not an unprimeable number, because it can be changed into a prime (198831301) 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, 79663 + ... + 82120.

It is an arithmetic number, because the mean of its divisors is an integer number (49748580).

Almost surely, 2^198831307 is an apocalyptic number.

198831307 is a deficient number, since it is larger than the sum of its proper divisors (163013).

198831307 is a wasteful number, since it uses less digits than its factorization.

198831307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163012.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 198831307 is about 14100.7555471329. The cubic root of 198831307 is about 583.6622286406.

The spelling of 198831307 in words is "one hundred ninety-eight million, eight hundred thirty-one thousand, three hundred seven".