268409 has 4 divisors (see below), whose sum is σ = 270480. Its totient is φ = 266340.

The previous prime is 268403. The next prime is 268439. The reversal of 268409 is 904862.

268409 is nontrivially palindromic in base 6.

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 268409 - 2⁸ = 268153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268403) 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, 827 + ... + 1104.

It is an arithmetic number, because the mean of its divisors is an integer number (67620).

2²⁶⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

268409 is a deficient number, since it is larger than the sum of its proper divisors (2071).

268409 is a wasteful number, since it uses less digits than its factorization.

268409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 268409 is about 518.0820398354. The cubic root of 268409 is about 64.5058384635.

The spelling of 268409 in words is "two hundred sixty-eight thousand, four hundred nine".