198788839 has 8 divisors (see below), whose sum is σ = 207663840. Its totient is φ = 189933216.

The previous prime is 198788819. The next prime is 198788893. The reversal of 198788839 is 938887891.

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 198788839 - 2¹⁵ = 198756071 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 (198788819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18597 + ... + 27265.

It is an arithmetic number, because the mean of its divisors is an integer number (25957980).

Almost surely, 2^198788839 is an apocalyptic number.

198788839 is a deficient number, since it is larger than the sum of its proper divisors (8875001).

198788839 is an equidigital number, since it uses as much as digits as its factorization.

198788839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9689.

The product of its digits is 6967296, while the sum is 61.

The square root of 198788839 is about 14099.2495899605. The cubic root of 198788839 is about 583.6206712473.

The spelling of 198788839 in words is "one hundred ninety-eight million, seven hundred eighty-eight thousand, eight hundred thirty-nine".