198858239 has 4 divisors (see below), whose sum is σ = 204232824. Its totient is φ = 193483656.

The previous prime is 198858229. The next prime is 198858259. The reversal of 198858239 is 932858891.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 198858239 - 2⁴ = 198858223 is a prime.

It is a super-2 number, since 2×198858239² = 79089198436362242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198858229) 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, 2687237 + ... + 2687310.

It is an arithmetic number, because the mean of its divisors is an integer number (51058206).

Almost surely, 2^198858239 is an apocalyptic number.

198858239 is a deficient number, since it is larger than the sum of its proper divisors (5374585).

198858239 is an equidigital number, since it uses as much as digits as its factorization.

198858239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374584.

The product of its digits is 1244160, while the sum is 53.

The square root of 198858239 is about 14101.7104990849. The cubic root of 198858239 is about 583.6885800935.

The spelling of 198858239 in words is "one hundred ninety-eight million, eight hundred fifty-eight thousand, two hundred thirty-nine".