198158839 has 8 divisors (see below), whose sum is σ = 200441120. Its totient is φ = 195885216.

The previous prime is 198158837. The next prime is 198158881. The reversal of 198158839 is 938851891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198158839 - 2¹ = 198158837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198158833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51217 + ... + 54949.

It is an arithmetic number, because the mean of its divisors is an integer number (25055140).

Almost surely, 2^198158839 is an apocalyptic number.

198158839 is a deficient number, since it is larger than the sum of its proper divisors (2282281).

198158839 is a wasteful number, since it uses less digits than its factorization.

198158839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4329.

The product of its digits is 622080, while the sum is 52.

The square root of 198158839 is about 14076.8902460735. The cubic root of 198158839 is about 583.0034834694.

The spelling of 198158839 in words is "one hundred ninety-eight million, one hundred fifty-eight thousand, eight hundred thirty-nine".