198409079 has 4 divisors (see below), whose sum is σ = 216446280. Its totient is φ = 180371880.

The previous prime is 198409073. The next prime is 198409111. The reversal of 198409079 is 970904891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198409079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198409073) 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, 9018584 + ... + 9018605.

It is an arithmetic number, because the mean of its divisors is an integer number (54111570).

Almost surely, 2^198409079 is an apocalyptic number.

198409079 is a deficient number, since it is larger than the sum of its proper divisors (18037201).

198409079 is a wasteful number, since it uses less digits than its factorization.

198409079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18037200.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 198409079 is about 14085.7757684836. The cubic root of 198409079 is about 583.2487907592.

The spelling of 198409079 in words is "one hundred ninety-eight million, four hundred nine thousand, seventy-nine".