726805 has 4 divisors (see below), whose sum is σ = 872172. Its totient is φ = 581440.

The previous prime is 726797. The next prime is 726809. The reversal of 726805 is 508627.

726805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508627 = 7 ⋅72661.

It can be written as a sum of positive squares in 2 ways, for example, as 531441 + 195364 = 729^2 + 442^2 .

It is not a de Polignac number, because 726805 - 2³ = 726797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726809) 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, 72676 + ... + 72685.

It is an arithmetic number, because the mean of its divisors is an integer number (218043).

2⁷²⁶⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

726805 is a deficient number, since it is larger than the sum of its proper divisors (145367).

726805 is a wasteful number, since it uses less digits than its factorization.

726805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145366.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 726805 is about 852.5285918959. The cubic root of 726805 is about 89.9095799703.

The spelling of 726805 in words is "seven hundred twenty-six thousand, eight hundred five".