409866 has 8 divisors (see below), whose sum is σ = 819744. Its totient is φ = 136620.

The previous prime is 409861. The next prime is 409867. The reversal of 409866 is 668904.

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

409866 is an admirable number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (409861) 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, 34150 + ... + 34161.

It is an arithmetic number, because the mean of its divisors is an integer number (102468).

2⁴⁰⁹⁸⁶⁶ is an apocalyptic number.

409866 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.

409866 is a wasteful number, since it uses less digits than its factorization.

409866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68316.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 409866 is about 640.2077787719. The cubic root of 409866 is about 74.2814941953.

It can be divided in two parts, 409 and 866, that added together give a triangular number (1275 = T₅₀).

The spelling of 409866 in words is "four hundred nine thousand, eight hundred sixty-six".