198591385 has 16 divisors (see below), whose sum is σ = 243129600. Its totient is φ = 155690496.

The previous prime is 198591373. The next prime is 198591389. The reversal of 198591385 is 583195891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198591385 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198591389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53097 + ... + 56713.

It is an arithmetic number, because the mean of its divisors is an integer number (15195600).

Almost surely, 2^198591385 is an apocalyptic number.

It is an amenable number.

198591385 is a deficient number, since it is larger than the sum of its proper divisors (44538215).

198591385 is a wasteful number, since it uses less digits than its factorization.

198591385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its digits is 388800, while the sum is 49.

The square root of 198591385 is about 14092.2455627199. The cubic root of 198591385 is about 583.4273733196.

The spelling of 198591385 in words is "one hundred ninety-eight million, five hundred ninety-one thousand, three hundred eighty-five".