813723 has 4 divisors (see below), whose sum is σ = 1084968. Its totient is φ = 542480.

The previous prime is 813721. The next prime is 813749. The reversal of 813723 is 327318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 813723 - 2¹ = 813721 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 813693 and 813702.

It is not an unprimeable number, because it can be changed into a prime (813721) 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 3 ways as a sum of consecutive naturals, for example, 135618 + ... + 135623.

It is an arithmetic number, because the mean of its divisors is an integer number (271242).

2⁸¹³⁷²³ is an apocalyptic number.

813723 is a deficient number, since it is larger than the sum of its proper divisors (271245).

813723 is a wasteful number, since it uses less digits than its factorization.

813723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271244.

The product of its digits is 1008, while the sum is 24.

The square root of 813723 is about 902.0659621114. The cubic root of 813723 is about 93.3595745375.

It can be divided in two parts, 8 and 13723, that added together give a palindrome (13731).

The spelling of 813723 in words is "eight hundred thirteen thousand, seven hundred twenty-three".