198978595 has 4 divisors (see below), whose sum is σ = 238774320. Its totient is φ = 159182872.

The previous prime is 198978569. The next prime is 198978601. The reversal of 198978595 is 595879891.

198978595 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 198978595 - 2⁷ = 198978467 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19897855 + ... + 19897864.

It is an arithmetic number, because the mean of its divisors is an integer number (59693580).

Almost surely, 2^198978595 is an apocalyptic number.

198978595 is a deficient number, since it is larger than the sum of its proper divisors (39795725).

198978595 is an equidigital number, since it uses as much as digits as its factorization.

198978595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39795724.

The product of its digits is 8164800, while the sum is 61.

The square root of 198978595 is about 14105.9772791537. The cubic root of 198978595 is about 583.8063126303.

The spelling of 198978595 in words is "one hundred ninety-eight million, nine hundred seventy-eight thousand, five hundred ninety-five".