355809 has 4 divisors (see below), whose sum is σ = 474416. Its totient is φ = 237204.

The previous prime is 355799. The next prime is 355811. The reversal of 355809 is 908553.

355809 = 132² + 133² + ... + 149².

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, and also an emirpimes, since its reverse is a distinct semiprime: 908553 = 3 ⋅302851.

It is not a de Polignac number, because 355809 - 2⁵ = 355777 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 355809.

It is not an unprimeable number, because it can be changed into a prime (355819) 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 3 ways as a sum of consecutive naturals, for example, 59299 + ... + 59304.

It is an arithmetic number, because the mean of its divisors is an integer number (118604).

2³⁵⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

355809 is a deficient number, since it is larger than the sum of its proper divisors (118607).

355809 is a wasteful number, since it uses less digits than its factorization.

355809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118606.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 355809 is about 596.4972757691. The cubic root of 355809 is about 70.8607334211.

The spelling of 355809 in words is "three hundred fifty-five thousand, eight hundred nine".