523405 has 4 divisors (see below), whose sum is σ = 628092. Its totient is φ = 418720.

The previous prime is 523403. The next prime is 523417. The reversal of 523405 is 504325.

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 170569 + 352836 = 413^2 + 594^2 .

It is not a de Polignac number, because 523405 - 2¹ = 523403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523403) by changing a digit.

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, 52336 + ... + 52345.

It is an arithmetic number, because the mean of its divisors is an integer number (157023).

2⁵²³⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

523405 is a deficient number, since it is larger than the sum of its proper divisors (104687).

523405 is a wasteful number, since it uses less digits than its factorization.

523405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104686.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 523405 is about 723.4673454967. The cubic root of 523405 is about 80.5896535966.

The spelling of 523405 in words is "five hundred twenty-three thousand, four hundred five".