726813 has 14 divisors (see below), whose sum is σ = 1090814. Its totient is φ = 484056.

The previous prime is 726811. The next prime is 726839. The reversal of 726813 is 318627.

It can be written as a sum of positive squares in only one way, i.e., 700569 + 26244 = 837^2 + 162^2 .

It is not a de Polignac number, because 726813 - 2¹ = 726811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 231 + ... + 1227.

2⁷²⁶⁸¹³ is an apocalyptic number.

It is an amenable number.

726813 is a deficient number, since it is larger than the sum of its proper divisors (364001).

726813 is an frugal number, since it uses more digits than its factorization.

726813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1000 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 726813 is about 852.5332838077. The cubic root of 726813 is about 89.9099098497.

The spelling of 726813 in words is "seven hundred twenty-six thousand, eight hundred thirteen".