408661 has 8 divisors (see below), whose sum is σ = 451584. Its totient is φ = 366720.

The previous prime is 408659. The next prime is 408677. The reversal of 408661 is 166804.

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

It is a cyclic number.

It is not a de Polignac number, because 408661 - 2¹ = 408659 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 (408631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876 + ... + 1258.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2⁴⁰⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

408661 is a deficient number, since it is larger than the sum of its proper divisors (42923).

408661 is a wasteful number, since it uses less digits than its factorization.

408661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 408661 is about 639.2659853301. The cubic root of 408661 is about 74.2086272399.

The spelling of 408661 in words is "four hundred eight thousand, six hundred sixty-one".