813826 has 16 divisors (see below), whose sum is σ = 1331064. Its totient is φ = 370944.

The previous prime is 813817. The next prime is 813829. The reversal of 813826 is 628318.

813826 = T₅₉ + T₆₀ + ... + T₁₇₁.

It can be written as a sum of positive squares in 4 ways, for example, as 172225 + 641601 = 415^2 + 801^2 .

It is a junction number, because it is equal to n+sod(n) for n = 813794 and 813803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2800 + ... + 3076.

2⁸¹³⁸²⁶ is an apocalyptic number.

813826 is a deficient number, since it is larger than the sum of its proper divisors (517238).

813826 is a wasteful number, since it uses less digits than its factorization.

813826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

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

The square root of 813826 is about 902.1230514736. The cubic root of 813826 is about 93.3635134826.

The spelling of 813826 in words is "eight hundred thirteen thousand, eight hundred twenty-six".