408861 has 16 divisors (see below), whose sum is σ = 638400. Its totient is φ = 257904.

The previous prime is 408857. The next prime is 408869. The reversal of 408861 is 168804.

It is not a de Polignac number, because 408861 - 2² = 408857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

408861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115 + ... + 911.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2⁴⁰⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

408861 is a deficient number, since it is larger than the sum of its proper divisors (229539).

408861 is a wasteful number, since it uses less digits than its factorization.

408861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 408861 is about 639.4223956040. The cubic root of 408861 is about 74.2207312454.

The spelling of 408861 in words is "four hundred eight thousand, eight hundred sixty-one".