268909 has 2 divisors, whose sum is σ = 268910. Its totient is φ = 268908.

The previous prime is 268897. The next prime is 268913. The reversal of 268909 is 909862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142884 + 126025 = 378^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 268909 - 2⁷ = 268781 is a prime.

268909 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134454 + 134455.

It is an arithmetic number, because the mean of its divisors is an integer number (134455).

2²⁶⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

268909 is a deficient number, since it is larger than the sum of its proper divisors (1).

268909 is an equidigital number, since it uses as much as digits as its factorization.

268909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 268909 is about 518.5643643753. The cubic root of 268909 is about 64.5458680610.

The spelling of 268909 in words is "two hundred sixty-eight thousand, nine hundred nine".