198431293 has 4 divisors (see below), whose sum is σ = 210103740. Its totient is φ = 186758848.

The previous prime is 198431291. The next prime is 198431323. The reversal of 198431293 is 392134891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 175218169 + 23213124 = 13237^2 + 4818^2 .

It is a cyclic number.

It is not a de Polignac number, because 198431293 - 2¹ = 198431291 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198431291) 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 3 ways as a sum of consecutive naturals, for example, 5836198 + ... + 5836231.

It is an arithmetic number, because the mean of its divisors is an integer number (52525935).

Almost surely, 2^198431293 is an apocalyptic number.

It is an amenable number.

198431293 is a deficient number, since it is larger than the sum of its proper divisors (11672447).

198431293 is a wasteful number, since it uses less digits than its factorization.

198431293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11672446.

The product of its digits is 46656, while the sum is 40.

The square root of 198431293 is about 14086.5642723838. The cubic root of 198431293 is about 583.2705569088.

The spelling of 198431293 in words is "one hundred ninety-eight million, four hundred thirty-one thousand, two hundred ninety-three".