405623 has 8 divisors (see below), whose sum is σ = 427680. Its totient is φ = 384160.

The previous prime is 405611. The next prime is 405641. The reversal of 405623 is 326504.

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 405623 - 2⁴ = 405607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405595 and 405604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405683) 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, 1961 + ... + 2157.

It is an arithmetic number, because the mean of its divisors is an integer number (53460).

2⁴⁰⁵⁶²³ is an apocalyptic number.

405623 is a deficient number, since it is larger than the sum of its proper divisors (22057).

405623 is a wasteful number, since it uses less digits than its factorization.

405623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 405623 is about 636.8853900036. The cubic root of 405623 is about 74.0242798341.

The spelling of 405623 in words is "four hundred five thousand, six hundred twenty-three".