198439894 has 4 divisors (see below), whose sum is σ = 297659844. Its totient is φ = 99219946.

The previous prime is 198439867. The next prime is 198439907. The reversal of 198439894 is 498934891.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 49609972 + ... + 49609975.

It is an arithmetic number, because the mean of its divisors is an integer number (74414961).

Almost surely, 2^198439894 is an apocalyptic number.

198439894 is a deficient number, since it is larger than the sum of its proper divisors (99219950).

198439894 is an equidigital number, since it uses as much as digits as its factorization.

198439894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99219949.

The product of its digits is 2239488, while the sum is 55.

The square root of 198439894 is about 14086.8695599839. The cubic root of 198439894 is about 583.2789840702.

The spelling of 198439894 in words is "one hundred ninety-eight million, four hundred thirty-nine thousand, eight hundred ninety-four".