199729117 has 4 divisors (see below), whose sum is σ = 228261856. Its totient is φ = 171196380.

The previous prime is 199729091. The next prime is 199729129. The reversal of 199729117 is 711927991.

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 a cyclic number.

It is not a de Polignac number, because 199729117 - 2⁷ = 199728989 is a prime.

It is a super-3 number, since 3×199729117³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199729147) 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, 14266359 + ... + 14266372.

It is an arithmetic number, because the mean of its divisors is an integer number (57065464).

Almost surely, 2^199729117 is an apocalyptic number.

It is an amenable number.

199729117 is a deficient number, since it is larger than the sum of its proper divisors (28532739).

199729117 is an equidigital number, since it uses as much as digits as its factorization.

199729117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28532738.

The product of its digits is 71442, while the sum is 46.

The square root of 199729117 is about 14132.5552183602. Note that the first 3 decimals coincide. The cubic root of 199729117 is about 584.5394061219.

It can be divided in two parts, 199 and 729117, that added together give a square (729316 = 854²).

The spelling of 199729117 in words is "one hundred ninety-nine million, seven hundred twenty-nine thousand, one hundred seventeen".