198431798 has 4 divisors (see below), whose sum is σ = 297647700. Its totient is φ = 99215898.

The previous prime is 198431797. The next prime is 198431843. The reversal of 198431798 is 897134891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198431797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49607948 + ... + 49607951.

It is an arithmetic number, because the mean of its divisors is an integer number (74411925).

Almost surely, 2^198431798 is an apocalyptic number.

198431798 is a deficient number, since it is larger than the sum of its proper divisors (99215902).

198431798 is an equidigital number, since it uses as much as digits as its factorization.

198431798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99215901.

The product of its digits is 435456, while the sum is 50.

The square root of 198431798 is about 14086.5821972542. The cubic root of 198431798 is about 583.2710517088.

The spelling of 198431798 in words is "one hundred ninety-eight million, four hundred thirty-one thousand, seven hundred ninety-eight".