405813 has 4 divisors (see below), whose sum is σ = 541088. Its totient is φ = 270540.

The previous prime is 405799. The next prime is 405817. The reversal of 405813 is 318504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 405813 - 2⁵ = 405781 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 405813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405817) 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, 67633 + ... + 67638.

It is an arithmetic number, because the mean of its divisors is an integer number (135272).

2⁴⁰⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

405813 is a deficient number, since it is larger than the sum of its proper divisors (135275).

405813 is a wasteful number, since it uses less digits than its factorization.

405813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135274.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 405813 is about 637.0345359555. The cubic root of 405813 is about 74.0358360638.

The spelling of 405813 in words is "four hundred five thousand, eight hundred thirteen".