198331639 has 8 divisors (see below), whose sum is σ = 229089168. Its totient is φ = 169695360.

The previous prime is 198331607. The next prime is 198331643. The reversal of 198331639 is 936133891.

It is a happy number.

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

It is not a de Polignac number, because 198331639 - 2⁵ = 198331607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198331595 and 198331604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198331649) 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, 530112 + ... + 530485.

It is an arithmetic number, because the mean of its divisors is an integer number (28636146).

Almost surely, 2^198331639 is an apocalyptic number.

198331639 is a deficient number, since it is larger than the sum of its proper divisors (30757529).

198331639 is a wasteful number, since it uses less digits than its factorization.

198331639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060625.

The product of its digits is 104976, while the sum is 43.

The square root of 198331639 is about 14083.0266278240. The cubic root of 198331639 is about 583.1728992994.

The spelling of 198331639 in words is "one hundred ninety-eight million, three hundred thirty-one thousand, six hundred thirty-nine".