199723993 has 4 divisors (see below), whose sum is σ = 228256000. Its totient is φ = 171191988.

The previous prime is 199723987. The next prime is 199723999. The reversal of 199723993 is 399327991.

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.

It is an interprime number because it is at equal distance from previous prime (199723987) and next prime (199723999).

It is a cyclic number.

It is not a de Polignac number, because 199723993 - 2²⁵ = 166169561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199723993.

It is not an unprimeable number, because it can be changed into a prime (199723999) 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, 14265993 + ... + 14266006.

It is an arithmetic number, because the mean of its divisors is an integer number (57064000).

Almost surely, 2^199723993 is an apocalyptic number.

It is an amenable number.

199723993 is a deficient number, since it is larger than the sum of its proper divisors (28532007).

199723993 is an equidigital number, since it uses as much as digits as its factorization.

199723993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28532006.

The product of its digits is 826686, while the sum is 52.

The square root of 199723993 is about 14132.3739336320. The cubic root of 199723993 is about 584.5344073423.

The spelling of 199723993 in words is "one hundred ninety-nine million, seven hundred twenty-three thousand, nine hundred ninety-three".