405923 has 8 divisors (see below), whose sum is σ = 469248. Its totient is φ = 343944.

The previous prime is 405917. The next prime is 405947. The reversal of 405923 is 329504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405923 - 2⁸ = 405667 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405923.

It is not an unprimeable number, because it can be changed into a prime (405323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440 + ... + 1002.

It is an arithmetic number, because the mean of its divisors is an integer number (58656).

2⁴⁰⁵⁹²³ is an apocalyptic number.

405923 is a deficient number, since it is larger than the sum of its proper divisors (63325).

405923 is a wasteful number, since it uses less digits than its factorization.

405923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 405923 is about 637.1208676539. The cubic root of 405923 is about 74.0425248640.

The spelling of 405923 in words is "four hundred five thousand, nine hundred twenty-three".