406423 has 2 divisors, whose sum is σ = 406424. Its totient is φ = 406422.

The previous prime is 406403. The next prime is 406447. The reversal of 406423 is 324604.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 406423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203211 + 203212.

It is an arithmetic number, because the mean of its divisors is an integer number (203212).

2⁴⁰⁶⁴²³ is an apocalyptic number.

406423 is a deficient number, since it is larger than the sum of its proper divisors (1).

406423 is an equidigital number, since it uses as much as digits as its factorization.

406423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 406423 is about 637.5131371195. The cubic root of 406423 is about 74.0729132812.

The spelling of 406423 in words is "four hundred six thousand, four hundred twenty-three".