198390385 has 16 divisors (see below), whose sum is σ = 240699600. Its totient is φ = 156967936.

The previous prime is 198390377. The next prime is 198390403. The reversal of 198390385 is 583093891.

It can be written as a sum of positive squares in 8 ways, for example, as 341056 + 198049329 = 584^2 + 14073^2 .

It is a cyclic number.

It is not a de Polignac number, because 198390385 - 2³ = 198390377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348381 + ... + 348949.

It is an arithmetic number, because the mean of its divisors is an integer number (15043725).

Almost surely, 2^198390385 is an apocalyptic number.

It is an amenable number.

198390385 is a deficient number, since it is larger than the sum of its proper divisors (42309215).

198390385 is a wasteful number, since it uses less digits than its factorization.

198390385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 198390385 is about 14085.1121756271. The cubic root of 198390385 is about 583.2304723848.

The spelling of 198390385 in words is "one hundred ninety-eight million, three hundred ninety thousand, three hundred eighty-five".