198823639 has 8 divisors (see below), whose sum is σ = 230619008. Its totient is φ = 167876280.

The previous prime is 198823633. The next prime is 198823649. The reversal of 198823639 is 936328891.

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 198823639 - 2⁹ = 198823127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198823592 and 198823601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198823633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211497 + ... + 212434.

It is an arithmetic number, because the mean of its divisors is an integer number (28827376).

Almost surely, 2^198823639 is an apocalyptic number.

198823639 is a deficient number, since it is larger than the sum of its proper divisors (31795369).

198823639 is an equidigital number, since it uses as much as digits as its factorization.

198823639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424005.

The product of its digits is 559872, while the sum is 49.

The square root of 198823639 is about 14100.4836441875. The cubic root of 198823639 is about 583.6547254971.

The spelling of 198823639 in words is "one hundred ninety-eight million, eight hundred twenty-three thousand, six hundred thirty-nine".