406663 has 4 divisors (see below), whose sum is σ = 424368. Its totient is φ = 388960.

The previous prime is 406661. The next prime is 406673. The reversal of 406663 is 366604.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 406663 - 2¹ = 406661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406661) 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, 8818 + ... + 8863.

It is an arithmetic number, because the mean of its divisors is an integer number (106092).

2⁴⁰⁶⁶⁶³ is an apocalyptic number.

406663 is a deficient number, since it is larger than the sum of its proper divisors (17705).

406663 is a wasteful number, since it uses less digits than its factorization.

406663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17704.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 406663 is about 637.7013407544. The cubic root of 406663 is about 74.0874908691.

The spelling of 406663 in words is "four hundred six thousand, six hundred sixty-three".