403805 has 4 divisors (see below), whose sum is σ = 484572. Its totient is φ = 323040.

The previous prime is 403787. The next prime is 403817. The reversal of 403805 is 508304.

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 119716 + 284089 = 346^2 + 533^2 .

It is not a de Polignac number, because 403805 - 2⁸ = 403549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40376 + ... + 40385.

It is an arithmetic number, because the mean of its divisors is an integer number (121143).

2⁴⁰³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

403805 is a deficient number, since it is larger than the sum of its proper divisors (80767).

403805 is an equidigital number, since it uses as much as digits as its factorization.

403805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80766.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 403805 is about 635.4565288043. The cubic root of 403805 is about 73.9135220620.

It can be divided in two parts, 403 and 805, that multiplied together give a triangular number (324415 = T₈₀₅).

The spelling of 403805 in words is "four hundred three thousand, eight hundred five".