405803 has 4 divisors (see below), whose sum is σ = 407640. Its totient is φ = 403968.

The previous prime is 405799. The next prime is 405817. The reversal of 405803 is 308504.

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

It is a cyclic number.

It is not a de Polignac number, because 405803 - 2² = 405799 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405863) 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, 533 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (101910).

2⁴⁰⁵⁸⁰³ is an apocalyptic number.

405803 is a deficient number, since it is larger than the sum of its proper divisors (1837).

405803 is a wasteful number, since it uses less digits than its factorization.

405803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836.

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

The square root of 405803 is about 637.0266870391. The cubic root of 405803 is about 74.0352279311.

The spelling of 405803 in words is "four hundred five thousand, eight hundred three".