198421793 has 8 divisors (see below), whose sum is σ = 205959936. Its totient is φ = 190954800.

The previous prime is 198421789. The next prime is 198421829. The reversal of 198421793 is 397124891.

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 198421793 - 2² = 198421789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198421703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12071 + ... + 23292.

It is an arithmetic number, because the mean of its divisors is an integer number (25744992).

Almost surely, 2^198421793 is an apocalyptic number.

It is an amenable number.

198421793 is a deficient number, since it is larger than the sum of its proper divisors (7538143).

198421793 is a wasteful number, since it uses less digits than its factorization.

198421793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35575.

The product of its digits is 108864, while the sum is 44.

The square root of 198421793 is about 14086.2270676005. The cubic root of 198421793 is about 583.2612486345.

The spelling of 198421793 in words is "one hundred ninety-eight million, four hundred twenty-one thousand, seven hundred ninety-three".