355805 has 4 divisors (see below), whose sum is σ = 426972. Its totient is φ = 284640.

The previous prime is 355799. The next prime is 355811. The reversal of 355805 is 508553.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508553 = 23 ⋅22111.

It is an interprime number because it is at equal distance from previous prime (355799) and next prime (355811).

It can be written as a sum of positive squares in 2 ways, for example, as 190969 + 164836 = 437^2 + 406^2 .

It is not a de Polignac number, because 355805 - 2⁸ = 355549 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11 and base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35576 + ... + 35585.

It is an arithmetic number, because the mean of its divisors is an integer number (106743).

2³⁵⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

355805 is a deficient number, since it is larger than the sum of its proper divisors (71167).

355805 is an equidigital number, since it uses as much as digits as its factorization.

355805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71166.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 355805 is about 596.4939228525. The cubic root of 355805 is about 70.8604678817.

The spelling of 355805 in words is "three hundred fifty-five thousand, eight hundred five".