408666 has 8 divisors (see below), whose sum is σ = 817344. Its totient is φ = 136220.

The previous prime is 408659. The next prime is 408677. The reversal of 408666 is 666804.

It is a happy number.

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

408666 is an admirable number.

408666 is a modest number, since divided by 666 gives 408 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34050 + ... + 34061.

It is an arithmetic number, because the mean of its divisors is an integer number (102168).

2⁴⁰⁸⁶⁶⁶ is an apocalyptic number.

408666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

408666 is a wasteful number, since it uses less digits than its factorization.

408666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68116.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 408666 is about 639.2698960533. The cubic root of 408666 is about 74.2089298882.

The spelling of 408666 in words is "four hundred eight thousand, six hundred sixty-six".