198798858 has 24 divisors (see below), whose sum is σ = 434916768. Its totient is φ = 65622312.

The previous prime is 198798851. The next prime is 198798863. The reversal of 198798858 is 858897891.

It is a junction number, because it is equal to n+sod(n) for n = 198798795 and 198798804.

It is not an unprimeable number, because it can be changed into a prime (198798851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51760 + ... + 55467.

It is an arithmetic number, because the mean of its divisors is an integer number (18121532).

Almost surely, 2^198798858 is an apocalyptic number.

198798858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198798858 is an abundant number, since it is smaller than the sum of its proper divisors (236117910).

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

198798858 is a wasteful number, since it uses less digits than its factorization.

198798858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107338 (or 107335 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 63.

The square root of 198798858 is about 14099.6048880811. The cubic root of 198798858 is about 583.6304759515.

The spelling of 198798858 in words is "one hundred ninety-eight million, seven hundred ninety-eight thousand, eight hundred fifty-eight".