826813 has 4 divisors (see below), whose sum is σ = 890428. Its totient is φ = 763200.

The previous prime is 826811. The next prime is 826831. The reversal of 826813 is 318628.

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

It can be written as a sum of positive squares in 2 ways, for example, as 444889 + 381924 = 667^2 + 618^2 .

It is a cyclic number.

It is not a de Polignac number, because 826813 - 2¹ = 826811 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 (826811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31788 + ... + 31813.

It is an arithmetic number, because the mean of its divisors is an integer number (222607).

2⁸²⁶⁸¹³ is an apocalyptic number.

It is an amenable number.

826813 is a deficient number, since it is larger than the sum of its proper divisors (63615).

826813 is a wasteful number, since it uses less digits than its factorization.

826813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63614.

The product of its digits is 2304, while the sum is 28.

The square root of 826813 is about 909.2925821758. The cubic root of 826813 is about 93.8575252209.

It can be divided in two parts, 8268 and 13, that added together give a square (8281 = 91²).

The spelling of 826813 in words is "eight hundred twenty-six thousand, eight hundred thirteen".