299921 has 4 divisors (see below), whose sum is σ = 302832. Its totient is φ = 297012.

The previous prime is 299909. The next prime is 299933. The reversal of 299921 is 129992.

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 an interprime number because it is at equal distance from previous prime (299909) and next prime (299933).

It is a cyclic number.

It is not a de Polignac number, because 299921 - 2⁶ = 299857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (299941) 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, 1295 + ... + 1508.

It is an arithmetic number, because the mean of its divisors is an integer number (75708).

2²⁹⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

299921 is a deficient number, since it is larger than the sum of its proper divisors (2911).

299921 is a wasteful number, since it uses less digits than its factorization.

299921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910.

The product of its digits is 2916, while the sum is 32.

The square root of 299921 is about 547.6504359534. The cubic root of 299921 is about 66.9374183587.

The spelling of 299921 in words is "two hundred ninety-nine thousand, nine hundred twenty-one".