198420659 has 4 divisors (see below), whose sum is σ = 198449280. Its totient is φ = 198392040.

The previous prime is 198420653. The next prime is 198420683. The reversal of 198420659 is 956024891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 198420659 - 2²⁰ = 197372083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198420653) 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, 3374 + ... + 20204.

It is an arithmetic number, because the mean of its divisors is an integer number (49612320).

Almost surely, 2^198420659 is an apocalyptic number.

198420659 is a deficient number, since it is larger than the sum of its proper divisors (28621).

198420659 is a wasteful number, since it uses less digits than its factorization.

198420659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28620.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 198420659 is about 14086.1868154586. The cubic root of 198420659 is about 583.2601375007.

The spelling of 198420659 in words is "one hundred ninety-eight million, four hundred twenty thousand, six hundred fifty-nine".