406823 has 4 divisors (see below), whose sum is σ = 416328. Its totient is φ = 397320.

The previous prime is 406817. The next prime is 406837. The reversal of 406823 is 328604.

It is a happy number.

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

It is not a de Polignac number, because 406823 - 2⁴ = 406807 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 (406873) 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, 4688 + ... + 4773.

It is an arithmetic number, because the mean of its divisors is an integer number (104082).

2⁴⁰⁶⁸²³ is an apocalyptic number.

406823 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

406823 is a deficient number, since it is larger than the sum of its proper divisors (9505).

406823 is an equidigital number, since it uses as much as digits as its factorization.

406823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 406823 is about 637.8267789925. The cubic root of 406823 is about 74.0972060749.

The spelling of 406823 in words is "four hundred six thousand, eight hundred twenty-three".