198201636 has 18 divisors (see below), whose sum is σ = 501009782. Its totient is φ = 66067200.

The previous prime is 198201607. The next prime is 198201671. The reversal of 198201636 is 636102891.

198201636 is a `hidden beast` number, since 19 + 8 + 2 + 0 + 1 + 636 = 666.

It can be written as a sum of positive squares in only one way, i.e., 193766400 + 4435236 = 13920^2 + 2106^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5505601 = 198201636 / (1 + 9 + 8 + 2 + 0 + 1 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 198201636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2752765 + ... + 2752836.

Almost surely, 2^198201636 is an apocalyptic number.

It is an amenable number.

198201636 is an abundant number, since it is smaller than the sum of its proper divisors (302808146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198201636 is a wasteful number, since it uses less digits than its factorization.

198201636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505611 (or 5505606 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 198201636 is about 14078.4102795735. The cubic root of 198201636 is about 583.0454514923.

The spelling of 198201636 in words is "one hundred ninety-eight million, two hundred one thousand, six hundred thirty-six".