198083509 has 8 divisors (see below), whose sum is σ = 213624320. Its totient is φ = 182586096.

The previous prime is 198083503. The next prime is 198083513. The reversal of 198083509 is 905380891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198083509 - 2⁷ = 198083381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198083503) 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, 1029 + ... + 19930.

It is an arithmetic number, because the mean of its divisors is an integer number (26703040).

Almost surely, 2^198083509 is an apocalyptic number.

It is an amenable number.

198083509 is a deficient number, since it is larger than the sum of its proper divisors (15540811).

198083509 is a wasteful number, since it uses less digits than its factorization.

198083509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21699.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 198083509 is about 14074.2143297592. The cubic root of 198083509 is about 582.9295979290.

The spelling of 198083509 in words is "one hundred ninety-eight million, eighty-three thousand, five hundred nine".