978198 has 16 divisors (see below), whose sum is σ = 2107056. Its totient is φ = 300960.

The previous prime is 978181. The next prime is 978203. The reversal of 978198 is 891879.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6193 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (131691).

2⁹⁷⁸¹⁹⁸ is an apocalyptic number.

978198 is an abundant number, since it is smaller than the sum of its proper divisors (1128858).

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

978198 is a wasteful number, since it uses less digits than its factorization.

978198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12559.

The product of its digits is 36288, while the sum is 42.

The square root of 978198 is about 989.0389274442. The cubic root of 978198 is about 99.2679203387.

It can be divided in two parts, 978 and 198, that added together give a triangular number (1176 = T₄₈).

The spelling of 978198 in words is "nine hundred seventy-eight thousand, one hundred ninety-eight".