199999725 has 12 divisors (see below), whose sum is σ = 330666336. Its totient is φ = 106666480.

The previous prime is 199999721. The next prime is 199999739. The reversal of 199999725 is 527999991.

It is not a de Polignac number, because 199999725 - 2² = 199999721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999721) 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 in 11 ways as a sum of consecutive naturals, for example, 1333257 + ... + 1333406.

It is an arithmetic number, because the mean of its divisors is an integer number (27555528).

Almost surely, 2^199999725 is an apocalyptic number.

199999725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199999725 is a deficient number, since it is larger than the sum of its proper divisors (130666611).

199999725 is a wasteful number, since it uses less digits than its factorization.

199999725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666676 (or 2666671 counting only the distinct ones).

The product of its digits is 4133430, while the sum is 60.

The square root of 199999725 is about 14142.1259010094. The cubic root of 199999725 is about 584.8032796075.

The spelling of 199999725 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred twenty-five".