198635898 has 16 divisors (see below), whose sum is σ = 406961856. Its totient is φ = 64596960.

The previous prime is 198635897. The next prime is 198635917. The reversal of 198635898 is 898536891.

198635898 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (198635893) 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, 403486 + ... + 403977.

It is an arithmetic number, because the mean of its divisors is an integer number (25435116).

Almost surely, 2^198635898 is an apocalyptic number.

198635898 is an abundant number, since it is smaller than the sum of its proper divisors (208325958).

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

198635898 is a wasteful number, since it uses less digits than its factorization.

198635898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807509.

The product of its digits is 3732480, while the sum is 57.

The square root of 198635898 is about 14093.8248179832. The cubic root of 198635898 is about 583.4709605789.

The spelling of 198635898 in words is "one hundred ninety-eight million, six hundred thirty-five thousand, eight hundred ninety-eight".