199888823 has 4 divisors (see below), whose sum is σ = 199935648. Its totient is φ = 199842000.

The previous prime is 199888783. The next prime is 199888841. The reversal of 199888823 is 328888991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328888991 = 103 ⋅3193097.

It is a cyclic number.

It is not a de Polignac number, because 199888823 - 2²² = 195694519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199888853) 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, 16286 + ... + 25787.

It is an arithmetic number, because the mean of its divisors is an integer number (49983912).

Almost surely, 2^199888823 is an apocalyptic number.

199888823 is a deficient number, since it is larger than the sum of its proper divisors (46825).

199888823 is an equidigital number, since it uses as much as digits as its factorization.

199888823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46824.

The product of its digits is 1990656, while the sum is 56.

The square root of 199888823 is about 14138.2043767941. The cubic root of 199888823 is about 584.6951663842.

The spelling of 199888823 in words is "one hundred ninety-nine million, eight hundred eighty-eight thousand, eight hundred twenty-three".