199998125 has 20 divisors (see below), whose sum is σ = 253493856.
Its totient is φ = 157710000.
The previous prime is 199998107. The next prime is 199998131. The reversal of 199998125 is 521899991.
It is not a de Polignac number, because 199998125 - 28 = 199997869 is a prime.
It is a Curzon number.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42122 + ... + 46628.
Almost surely, 2199998125 is an apocalyptic number.
It is an amenable number.
199998125 is a deficient number, since it is larger than the sum of its proper divisors (53495731).
199998125 is an frugal number, since it uses more digits than its factorization.
199998125 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4598 (or 4583 counting only the distinct ones).
The product of its digits is 524880, while the sum is 53.
The square root of 199998125 is about 14142.0693323148.
The cubic root of 199998125 is about 584.8017201258.
The spelling of 199998125 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred twenty-five".