199986228 has 72 divisors (see below), whose sum is σ = 546474656. Its totient is φ = 61300800.

The previous prime is 199986217. The next prime is 199986251. The reversal of 199986228 is 822689991.

199986228 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 8 + 622 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154263 + ... + 155553.

Almost surely, 2^199986228 is an apocalyptic number.

199986228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199986228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273237328).

199986228 is an abundant number, since it is smaller than the sum of its proper divisors (346488428).

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

199986228 is a wasteful number, since it uses less digits than its factorization.

199986228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645 (or 1640 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 199986228 is about 14141.6487016189. The cubic root of 199986228 is about 584.7901241437.

The spelling of 199986228 in words is "one hundred ninety-nine million, nine hundred eighty-six thousand, two hundred twenty-eight".