355405 has 4 divisors (see below), whose sum is σ = 426492. Its totient is φ = 284320.

The previous prime is 355379. The next prime is 355417. The reversal of 355405 is 504553.

355405 = 184² + 185² + ... + 193².

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212521 + 142884 = 461^2 + 378^2 .

It is a de Polignac number, because none of the positive numbers 2^k-355405 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35536 + ... + 35545.

It is an arithmetic number, because the mean of its divisors is an integer number (106623).

2³⁵⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

355405 is a deficient number, since it is larger than the sum of its proper divisors (71087).

355405 is an equidigital number, since it uses as much as digits as its factorization.

355405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71086.

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 355405 is about 596.1585359617. The cubic root of 355405 is about 70.8339038785.

Adding to 355405 its reverse (504553), we get a palindrome (859958).

The spelling of 355405 in words is "three hundred fifty-five thousand, four hundred five".