198218408 has 8 divisors (see below), whose sum is σ = 371659530. Its totient is φ = 99109200.

The previous prime is 198218401. The next prime is 198218429. The reversal of 198218408 is 804812891.

It can be written as a sum of positive squares in only one way, i.e., 188842564 + 9375844 = 13742^2 + 3062^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (198218401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12388643 + ... + 12388658.

Almost surely, 2^198218408 is an apocalyptic number.

It is an amenable number.

198218408 is a deficient number, since it is larger than the sum of its proper divisors (173441122).

198218408 is a wasteful number, since it uses less digits than its factorization.

198218408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24777307 (or 24777303 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 198218408 is about 14079.0059308177. The cubic root of 198218408 is about 583.0618969712.

The spelling of 198218408 in words is "one hundred ninety-eight million, two hundred eighteen thousand, four hundred eight".