423805 has 4 divisors (see below), whose sum is σ = 508572. Its totient is φ = 339040.

The previous prime is 423803. The next prime is 423823. The reversal of 423805 is 508324.

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 151321 + 272484 = 389^2 + 522^2 .

It is not a de Polignac number, because 423805 - 2¹ = 423803 is a prime.

It is a super-2 number, since 2×423805² = 359221356050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42376 + ... + 42385.

It is an arithmetic number, because the mean of its divisors is an integer number (127143).

2⁴²³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

423805 is a deficient number, since it is larger than the sum of its proper divisors (84767).

423805 is an equidigital number, since it uses as much as digits as its factorization.

423805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84766.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 423805 is about 651.0030721894. The cubic root of 423805 is about 75.1141964045.

The spelling of 423805 in words is "four hundred twenty-three thousand, eight hundred five".