406866 has 32 divisors (see below), whose sum is σ = 887040. Its totient is φ = 123984.

The previous prime is 406859. The next prime is 406873. The reversal of 406866 is 668604.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (406859) and next prime (406873).

It is an Ulam number.

It is an unprimeable number.

406866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4861 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁴⁰⁶⁸⁶⁶ is an apocalyptic number.

406866 is an abundant number, since it is smaller than the sum of its proper divisors (480174).

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

406866 is a wasteful number, since it uses less digits than its factorization.

406866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150.

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

The square root of 406866 is about 637.8604863134. The cubic root of 406866 is about 74.0998166022.

The spelling of 406866 in words is "four hundred six thousand, eight hundred sixty-six".