198643636 has 6 divisors (see below), whose sum is σ = 347626370. Its totient is φ = 99321816.

The previous prime is 198643631. The next prime is 198643673. The reversal of 198643636 is 636346891.

It can be written as a sum of positive squares in only one way, i.e., 146168100 + 52475536 = 12090^2 + 7244^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198643631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24830451 + ... + 24830458.

Almost surely, 2^198643636 is an apocalyptic number.

It is an amenable number.

198643636 is a deficient number, since it is larger than the sum of its proper divisors (148982734).

198643636 is a wasteful number, since it uses less digits than its factorization.

198643636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49660913 (or 49660911 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 198643636 is about 14094.0993326995. The cubic root of 198643636 is about 583.4785369866.

The spelling of 198643636 in words is "one hundred ninety-eight million, six hundred forty-three thousand, six hundred thirty-six".