408665 has 12 divisors (see below), whose sum is σ = 514596. Its totient is φ = 311328.

The previous prime is 408659. The next prime is 408677. The reversal of 408665 is 566804.

It can be written as a sum of positive squares in 2 ways, for example, as 267289 + 141376 = 517^2 + 376^2 .

It is not a de Polignac number, because 408665 - 2¹⁴ = 392281 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8672 + ... + 8718.

It is an arithmetic number, because the mean of its divisors is an integer number (42883).

2⁴⁰⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

408665 is a deficient number, since it is larger than the sum of its proper divisors (105931).

408665 is an equidigital number, since it uses as much as digits as its factorization.

408665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 408665 is about 639.2691139106. The cubic root of 408665 is about 74.2088693587.

The spelling of 408665 in words is "four hundred eight thousand, six hundred sixty-five".