268309 has 4 divisors (see below), whose sum is σ = 272160. Its totient is φ = 264460.

The previous prime is 268297. The next prime is 268343. The reversal of 268309 is 903862.

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 a cyclic number.

It is not a de Polignac number, because 268309 - 2⁹ = 267797 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 (268909) 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, 1819 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2²⁶⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

268309 is a deficient number, since it is larger than the sum of its proper divisors (3851).

268309 is an equidigital number, since it uses as much as digits as its factorization.

268309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 268309 is about 517.9855210332. The cubic root of 268309 is about 64.4978265798.

The spelling of 268309 in words is "two hundred sixty-eight thousand, three hundred nine".