405123 has 8 divisors (see below), whose sum is σ = 547008. Its totient is φ = 266664.

The previous prime is 405091. The next prime is 405143. The reversal of 405123 is 321504.

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

It is not a de Polignac number, because 405123 - 2⁵ = 405091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405143) 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, 565 + ... + 1062.

It is an arithmetic number, because the mean of its divisors is an integer number (68376).

2⁴⁰⁵¹²³ is an apocalyptic number.

405123 is a deficient number, since it is larger than the sum of its proper divisors (141885).

405123 is a wasteful number, since it uses less digits than its factorization.

405123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 405123 is about 636.4927336584. The cubic root of 405123 is about 73.9938514492.

Adding to 405123 its reverse (321504), we get a palindrome (726627).

It can be divided in two parts, 405 and 123, that added together give a triangular number (528 = T₃₂).

The spelling of 405123 in words is "four hundred five thousand, one hundred twenty-three".