199003993 has 4 divisors (see below), whose sum is σ = 199150308. Its totient is φ = 198857680.

The previous prime is 199003979. The next prime is 199003997. The reversal of 199003993 is 399300991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399300991 = 139 ⋅2872669.

It can be written as a sum of positive squares in 2 ways, for example, as 121616784 + 77387209 = 11028^2 + 8797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199003993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199003997) 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 3 ways as a sum of consecutive naturals, for example, 71098 + ... + 73843.

It is an arithmetic number, because the mean of its divisors is an integer number (49787577).

Almost surely, 2^199003993 is an apocalyptic number.

It is an amenable number.

199003993 is a deficient number, since it is larger than the sum of its proper divisors (146315).

199003993 is a wasteful number, since it uses less digits than its factorization.

199003993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146314.

The product of its (nonzero) digits is 59049, while the sum is 43.

The square root of 199003993 is about 14106.8775070885. The cubic root of 199003993 is about 583.8311509501.

The spelling of 199003993 in words is "one hundred ninety-nine million, three thousand, nine hundred ninety-three".