978000198 has 16 divisors (see below), whose sum is σ = 2235429120. Its totient is φ = 279428616.

The previous prime is 978000193. The next prime is 978000209. The reversal of 978000198 is 891000879.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 23285719 = 978000198 / (9 + 7 + 8 + 0 + 0 + 0 + 1 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978000193) 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, 11642818 + ... + 11642901.

It is an arithmetic number, because the mean of its divisors is an integer number (139714320).

Almost surely, 2^978000198 is an apocalyptic number.

978000198 is an abundant number, since it is smaller than the sum of its proper divisors (1257428922).

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

978000198 is a wasteful number, since it uses less digits than its factorization.

978000198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23285731.

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

The square root of 978000198 is about 31272.9947078945. The cubic root of 978000198 is about 992.6122887926.

The spelling of 978000198 in words is "nine hundred seventy-eight million, one hundred ninety-eight", and thus it is an aban number.