408385 has 4 divisors (see below), whose sum is σ = 490068. Its totient is φ = 326704.

The previous prime is 408379. The next prime is 408389. The reversal of 408385 is 583804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142129 + 266256 = 377^2 + 516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408385 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408389) 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, 40834 + ... + 40843.

It is an arithmetic number, because the mean of its divisors is an integer number (122517).

2⁴⁰⁸³⁸⁵ is an apocalyptic number.

It is an amenable number.

408385 is a deficient number, since it is larger than the sum of its proper divisors (81683).

408385 is an equidigital number, since it uses as much as digits as its factorization.

408385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81682.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 408385 is about 639.0500762851. The cubic root of 408385 is about 74.1919172254.

It can be divided in two parts, 408 and 385, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 408385 in words is "four hundred eight thousand, three hundred eighty-five".