198378417 has 8 divisors (see below), whose sum is σ = 269495424. Its totient is φ = 129756848.

The previous prime is 198378391. The next prime is 198378463. The reversal of 198378417 is 714873891.

198378417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 198378417 - 2¹² = 198374321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198378017) 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, 623673 + ... + 623990.

It is an arithmetic number, because the mean of its divisors is an integer number (33686928).

Almost surely, 2^198378417 is an apocalyptic number.

It is an amenable number.

198378417 is a deficient number, since it is larger than the sum of its proper divisors (71117007).

198378417 is a wasteful number, since it uses less digits than its factorization.

198378417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247719.

The product of its digits is 338688, while the sum is 48.

The square root of 198378417 is about 14084.6873234730. The cubic root of 198378417 is about 583.2187442582.

The spelling of 198378417 in words is "one hundred ninety-eight million, three hundred seventy-eight thousand, four hundred seventeen".