199828991 has 8 divisors (see below), whose sum is σ = 208706784. Its totient is φ = 190967040.

The previous prime is 199828969. The next prime is 199828997.

199828991 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199828991 - 2⁶ = 199828927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199828997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27095 + ... + 33671.

It is an arithmetic number, because the mean of its divisors is an integer number (26088348).

Almost surely, 2^199828991 is an apocalyptic number.

199828991 is a deficient number, since it is larger than the sum of its proper divisors (8877793).

199828991 is a wasteful number, since it uses less digits than its factorization.

199828991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921.

The product of its digits is 839808, while the sum is 56.

The square root of 199828991 is about 14136.0882495831. The cubic root of 199828991 is about 584.6368223312.

The spelling of 199828991 in words is "one hundred ninety-nine million, eight hundred twenty-eight thousand, nine hundred ninety-one".