199957793 has 4 divisors (see below), whose sum is σ = 228523200. Its totient is φ = 171392388.

The previous prime is 199957753. The next prime is 199957799. The reversal of 199957793 is 397759991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 397759991 = 73 ⋅5448767.

It is a cyclic number.

It is not a de Polignac number, because 199957793 - 2¹⁸ = 199695649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199957799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14282693 + ... + 14282706.

It is an arithmetic number, because the mean of its divisors is an integer number (57130800).

Almost surely, 2^199957793 is an apocalyptic number.

It is an amenable number.

199957793 is a deficient number, since it is larger than the sum of its proper divisors (28565407).

199957793 is an equidigital number, since it uses as much as digits as its factorization.

199957793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28565406.

The product of its digits is 4822335, while the sum is 59.

The square root of 199957793 is about 14140.6433021981. The cubic root of 199957793 is about 584.7624067428.

The spelling of 199957793 in words is "one hundred ninety-nine million, nine hundred fifty-seven thousand, seven hundred ninety-three".