255409 has 16 divisors (see below), whose sum is σ = 331776. Its totient is φ = 190800.

The previous prime is 255383. The next prime is 255413. The reversal of 255409 is 904552.

It is a cyclic number.

It is not a de Polignac number, because 255409 - 2¹¹ = 253361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255419) 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 15 ways as a sum of consecutive naturals, for example, 2334 + ... + 2440.

It is an arithmetic number, because the mean of its divisors is an integer number (20736).

2²⁵⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

255409 is a deficient number, since it is larger than the sum of its proper divisors (76367).

255409 is a wasteful number, since it uses less digits than its factorization.

255409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 255409 is about 505.3800550081. The cubic root of 255409 is about 63.4471422408.

The spelling of 255409 in words is "two hundred fifty-five thousand, four hundred nine".