199929823 has 16 divisors (see below), whose sum is σ = 213000192. Its totient is φ = 187264000.

The previous prime is 199929811. The next prime is 199929859. The reversal of 199929823 is 328929991.

It is a cyclic number.

It is not a de Polignac number, because 199929823 - 2⁹ = 199929311 is a prime.

It is a super-2 number, since 2×199929823² = 79943868249622658, which contains 22 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 (199929893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311583 + ... + 312223.

It is an arithmetic number, because the mean of its divisors is an integer number (13312512).

Almost surely, 2^199929823 is an apocalyptic number.

199929823 is a deficient number, since it is larger than the sum of its proper divisors (13070369).

199929823 is a wasteful number, since it uses less digits than its factorization.

199929823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926.

The product of its digits is 629856, while the sum is 52.

The square root of 199929823 is about 14139.6542744156. The cubic root of 199929823 is about 584.7351400433.

The spelling of 199929823 in words is "one hundred ninety-nine million, nine hundred twenty-nine thousand, eight hundred twenty-three".