199555128 has 48 divisors (see below), whose sum is σ = 541522800. Its totient is φ = 66387840.

The previous prime is 199555121. The next prime is 199555151. The reversal of 199555128 is 821555991.

199555128 is a `hidden beast` number, since 1 + 9 + 95 + 551 + 2 + 8 = 666.

It is a super-2 number, since 2×199555128² = 79644498222192768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199555121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38533 + ... + 43403.

It is an arithmetic number, because the mean of its divisors is an integer number (11281725).

Almost surely, 2^199555128 is an apocalyptic number.

199555128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199555128 is an abundant number, since it is smaller than the sum of its proper divisors (341967672).

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

199555128 is a wasteful number, since it uses less digits than its factorization.

199555128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5452 (or 5445 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The square root of 199555128 is about 14126.3982670743. The cubic root of 199555128 is about 584.3696212074.

The spelling of 199555128 in words is "one hundred ninety-nine million, five hundred fifty-five thousand, one hundred twenty-eight".