299991 has 12 divisors (see below), whose sum is σ = 423672. Its totient is φ = 188784.

The previous prime is 299983. The next prime is 299993. The reversal of 299991 is 199992.

It is a happy number.

It is not a de Polignac number, because 299991 - 2³ = 299983 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

299991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (299993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 945 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (35306).

2²⁹⁹⁹⁹¹ is an apocalyptic number.

299991 is a deficient number, since it is larger than the sum of its proper divisors (123681).

299991 is a wasteful number, since it uses less digits than its factorization.

299991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 299 counting only the distinct ones).

The product of its digits is 13122, while the sum is 39.

The square root of 299991 is about 547.7143416052. The cubic root of 299991 is about 66.9426255686.

Subtracting from 299991 its reverse (199992), we obtain a palindrome (99999).

The spelling of 299991 in words is "two hundred ninety-nine thousand, nine hundred ninety-one".