405663 has 4 divisors (see below), whose sum is σ = 540888. Its totient is φ = 270440.

The previous prime is 405659. The next prime is 405667. The reversal of 405663 is 366504.

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

It is an interprime number because it is at equal distance from previous prime (405659) and next prime (405667).

It is a cyclic number.

It is not a de Polignac number, because 405663 - 2² = 405659 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405667) 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, 67608 + ... + 67613.

It is an arithmetic number, because the mean of its divisors is an integer number (135222).

2⁴⁰⁵⁶⁶³ is an apocalyptic number.

405663 is a deficient number, since it is larger than the sum of its proper divisors (135225).

405663 is a wasteful number, since it uses less digits than its factorization.

405663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135224.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 405663 is about 636.9167920537. The cubic root of 405663 is about 74.0267130244.

The spelling of 405663 in words is "four hundred five thousand, six hundred sixty-three".