198078 has 8 divisors (see below), whose sum is σ = 396168. Its totient is φ = 66024.

The previous prime is 198073. The next prime is 198083. The reversal of 198078 is 870891.

It is an interprime number because it is at equal distance from previous prime (198073) and next prime (198083).

It is a sphenic number, since it is the product of 3 distinct primes.

198078 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16501 + ... + 16512.

It is an arithmetic number, because the mean of its divisors is an integer number (49521).

2¹⁹⁸⁰⁷⁸ is an apocalyptic number.

198078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198078 is a wasteful number, since it uses less digits than its factorization.

198078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33018.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 198078 is about 445.0595465778. The cubic root of 198078 is about 58.2924193830.

The spelling of 198078 in words is "one hundred ninety-eight thousand, seventy-eight".