813705 has 16 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 408320.

The previous prime is 813697. The next prime is 813707. The reversal of 813705 is 507318.

It is not a de Polignac number, because 813705 - 2³ = 813697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (813707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1341 + ... + 1850.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2⁸¹³⁷⁰⁵ is an apocalyptic number.

813705 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

813705 is a deficient number, since it is larger than the sum of its proper divisors (565239).

813705 is a wasteful number, since it uses less digits than its factorization.

813705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 813705 is about 902.0559849588. The cubic root of 813705 is about 93.3588861441.

The spelling of 813705 in words is "eight hundred thirteen thousand, seven hundred five".