705805 has 4 divisors (see below), whose sum is σ = 846972. Its totient is φ = 564640.

The previous prime is 705787. The next prime is 705821. The reversal of 705805 is 508507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508507 = 23 ⋅22109.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 619369 = 294^2 + 787^2 .

It is not a de Polignac number, because 705805 - 2⁹ = 705293 is a prime.

It is a Duffinian number.

705805 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 705805.

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, 70576 + ... + 70585.

It is an arithmetic number, because the mean of its divisors is an integer number (211743).

2⁷⁰⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

705805 is a deficient number, since it is larger than the sum of its proper divisors (141167).

705805 is a wasteful number, since it uses less digits than its factorization.

705805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141166.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 705805 is about 840.1220149478. The cubic root of 705805 is about 89.0351668458.

The spelling of 705805 in words is "seven hundred five thousand, eight hundred five".