405423 has 12 divisors (see below), whose sum is σ = 592488. Its totient is φ = 267120.

The previous prime is 405413. The next prime is 405437. The reversal of 405423 is 324504.

It is a happy number.

It is not a de Polignac number, because 405423 - 2⁴ = 405407 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 405396 and 405405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405413) 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 11 ways as a sum of consecutive naturals, for example, 753 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (49374).

2⁴⁰⁵⁴²³ is an apocalyptic number.

405423 is a deficient number, since it is larger than the sum of its proper divisors (187065).

405423 is a wasteful number, since it uses less digits than its factorization.

405423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 405423 is about 636.7283565226. The cubic root of 405423 is about 74.0121114824.

Adding to 405423 its reverse (324504), we get a palindrome (729927).

It can be divided in two parts, 405 and 423, that added together give a palindrome (828).

The spelling of 405423 in words is "four hundred five thousand, four hundred twenty-three".