313805 has 4 divisors (see below), whose sum is σ = 376572. Its totient is φ = 251040.

The previous prime is 313783. The next prime is 313829. The reversal of 313805 is 508313.

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 70756 + 243049 = 266^2 + 493^2 .

It is not a de Polignac number, because 313805 - 2⁶ = 313741 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon 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, 31376 + ... + 31385.

It is an arithmetic number, because the mean of its divisors is an integer number (94143).

2³¹³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

313805 is a deficient number, since it is larger than the sum of its proper divisors (62767).

313805 is an equidigital number, since it uses as much as digits as its factorization.

313805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62766.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 313805 is about 560.1830058115. The cubic root of 313805 is about 67.9547709614.

The spelling of 313805 in words is "three hundred thirteen thousand, eight hundred five".